The author: Dr. Donald Perkins at the weather station now #StayingAtHome because of #lockdown.

Llansadwrn (Anglesey)

Diary 2020

21 plus 2

Logo: Llansadwrn Weather - Melin Llynnon, Ynys Môn

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Times are GMT (UTC, Z). Observations at this station [ ] are 24-h 09-09 GMT, some others { } occasionally refer to other 24-h periods, extremes (provisional) maximum, minimum, rainfall and sunshine are usually 21-21 GMT. When averages are referred to (.) compares with the last decade and [.] with the new 30-y climatological average [1981 - 2010]. All data are subject to verification and amendment.


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JANUARY EVENTS
  • Record 17.4C 'on this day' temperature recorded in Llanfairfechan on the 7th Chosen event.
  • Heavy rainfall in Llansadwrn and Snowdonia on the 11th Chosen event.
  • Storm Brendan hits hard on the 13th Chosen event.
  • Unusual persistent foggy weather with two rare fog at 0900 GMT observation on the 22nd Chosen event.
  • Winter was not quite over on the 28th Chosen event.
FEBRUARY EVENTS
  • Very low humidity recorded. Föhn-enhanced temperatures made for a warm day and brought out the bees on the 7th Chosen event.
  • Storm Ciara brought heavy rain and gales on the 8th Chosen event.
  • Cold air from the Canadian Arctic brought a brief wintry spell on the 11th Chosen event.
  • Storm Dennis brought high winds and tidal surges around the coast on the 15th Chosen event.
  • Large 2 cm diameter hail shower at Gorwel Heights, Llanfairfechan on the 16th Chosen event.
MARCH EVENTS
  • A cold night and Snowdon (photo) had a covering of snow and frost deposition on the 6th Chosen event.
  • A close encounter with Mrs Prickles, a weather station hedgehog, on the 20th Chosen event.
  • Confined to our property #lockdown the observer and head gardener making the best of it on the 23rd Chosen event.
APRIL EVENTS
  • That Föhn wind again and the first bluebells of the season on the 5th Chosen event.
  • Thick haze result of air pollution and Saharan dust on the 10th Chosen event.
  • A quiet walk through the weather station wood listening to the birds and a close encounter with a pile of plates on Sunday the 19th Chosen event.
  • Very low soil moisture ' a very dry event' observations on the 21st Chosen event.
  • RETRO: The dry spell in March and April 2003, and concerns about soil water Chosen event.
  • RETRO: The 18-day drought of May 2004 Chosen event.
  • Dry grass no dew mornings, but heavy guttation seen on lysimeter grass for explanation see the 24th Chosen event.

January 2020

January 1 - a fine sunny morning to start the new year, cool overnight air minimum 2.2C with a touch of ground frost (-1.4C). Air pressure was steady on 1029 mb with high-pressure to the S 1036 mb Spain and 1035 mb SE Europe. Low 971 mb was N of Iceland while a low over Biscay was losing its identity another 970 mb was over the Atlantic to the west. It was sunny along the North Wales coast to N and N E England while SE England had mist and fog. Visibility was good and it was possible to make out the last remnants of a snow patch on Carnedd Llywelyn, otherwise snow was absent from the mountains (Loch Glascarnoch 10.7C Milford Haven 9.2C Redesdale Camp -6.7C Plymouth 3.0 mm Leeming 5.3h Hawarden 5.1h) [Max 8.6C Min 2.2C Grass -1.4C Rain nil]. Jasmine has been flowering in the garden all winter.A mostly cloudy and very windy day on the 2nd with a deepening depression 986 mb W of Shannon, Ireland. A cold front lay W of Ireland to Cape Wrath. The SW'ly was blowing force 6/7 with strong gusts. We were in warm sector air (8.6C just before 0900 GMT), the temperature rising through the day reaching 10.4C by 2037 GMT and 11.9C at Gorwel. Rain in the afternoon from 15-1730 GMT was moderate to heavy at times (5 mm/h at 1600 GMT). A gust of 43 mph was recorded at 1600 GMT at Gorwel Heights, Llanfairfechan (Bude 12.0C Hawarden 11.9C Shobdon -0.4 C Achnagart 39.6 mm Capel Curig 18.8C Leconfield 1.6h Valley 0.0h) [Max 10.4C Min 2.3C Rain 9.8 mm]. A fine morning on the 3rd with a clearing sky and pressure 1022 mb rising rapidly. Atlantic-high 1032 mb was W of Cap Finisterre, a cold front had passed over at 0212 GMT. There was a burst of rain (12 mm/h) and the wind backed SW to N then fell calm. Currently the front was lying SW England to the Wash. We had a dry sunny day with Valley reporting the most sunshine (Swanage 11.0C Pembrey Sands 9.2C Kielder Castle -0.2C Santon Downham 14.2 mm Valley 5.7h) [Max 8.4C Min 4.5C Grass 0.1C Rain trace]. Well we did have a nice day yesterday. Today the 4th in contrast began with overcast sky, fine drizzle and poor visibility. Pressure was steady on 1034 mb with high 1039 mb over Biscay. Low 971 mb was over the Denmark Strait with associated fronts N of Scotland. We had some light showers of rain then in the afternoon the cloud thinned to give some sunshine before dark (Achnagart 10.9C Mumbles Head 10.5C Baltasound 4.9C Benson -0.7C Kinlochewe 23.6 mm Leconfield 5.9h Aberdaron 4.3h) [Max 8.3C Min 3.5C Grass -0.6C Rain 1.2 mm].

The 5th began fine and breezy with moderate misty visibility. Pressure was on 1020 mb with high 1038 mb over Brittany. Looking a little brighter the cloud seemed to be breaking, but soon thickened again with drizzle and slight rain interspersed with promising brighter spells (Aberdeen 12.5C Wattisham 1.6C Achnagart 20.2 mm Capel Curig 12 mm Boulmer 2.2h Hawarden 1.6h) [Max 9.1C Min 5.8C Rain 1.8 mm]. Snowdrops had been flowering in the garden since 31 December 2019.A very windy day on the 6th with pressure 1012 mb falling rapidly. Low 959 mb was just S of Iceland and there was a cold front over Ireland and western Scotland. There was a band of rain over the Irish Sea at 0900 GMT. During the morning Gorwel Heights had a gust of 50 mph, there were gales on high ground with Capel Curig reporting gusts of 63 mph (Lossiemouth 11.9C Leek 6.9C Okehampton 4.2C Achnagart 25.2 mm Whitechurch 14.8 mm Shoeburyness 3.4h) [Max 9.9C Min 7.0C Rain 6.0 mm]. Derek Brockway BBC Wales weatherman.Another wet and windy day on the 7th the sky overcast at 0900 GMT with slight rain and moderate visibility. Blustery SSW'ly wind strong to gale force in the afternoon. I tried going for a walk, but gave up as on reaching the first corner the wind was so strong that it was too dangerous to continue on the road; the Britannia Bridge had a 30 mph restriction imposed. South Uist reported gust of 67 mph, Capel Curig 55 mph and 51 mph at 1230 GMT at Gorwel Heights in Llanfairfechan. Record Föhn-enhanced temperatures were recorded today 15.3C at Murlough Bay in County Antrim, Northern Ireland, and 16.9C at Gorddinog and 17.4C at Gorwel Heights in Llanfairfechan at 1250 GMT both stations beating the previous highest 15.0C recorded at Rhyl in 1934 and at St. Abbs Head in 1989 (TORRO). The 17C Llanfairfechan temperature was featured by BBC Weatherman Derek Brockway on the 6.30 Wales News this evening (Murlough 15.3C Porthmadog 10.2C Lo min Shawbury 0.8C Porthmadog 1.6C Cassley 60.0 mm Capel Curig 11.4 mm Kinloss 2.6h Hawarden 0.8h Valley 0.0h) [Max 11.5C Min 4.4C Grass -0.1C Rain 1.2]. A promising start to the 8th with a few breaks in cloud overhead the station, Although pressure 1021 mb rising from a low of 1014 mb at 0017 GMT, hopes soon dashed as closed over again. Remnants of snow seen on Snowdon in the afternoon. It kept fine and dry though cloudy with occasional appearances of weak sunshine as cloud thinned a little. Rain came along by evening moderate to heavy at times, a pretty wet day in Wales overall [Capel Curig 24.4 mm Lake Vyrnwy 23.0 mm Sennybridge/ Mumbles Hd. 17.0 mm Llansadwrn 16.0 mm] (St James Park 12.3C Aviemore 1.2C Cassley 21.6 mm Cardiff 11.4 mm Dyce 5.1h St Athan 0.8h Valley 0.0h) [Max 9.8C Min 6.8C Rain 16.0 mm] . Another grey and dull January morning on the 9th, damp and misty with drizzle. Pressure was rising quickly with low 993 mb over the Celtic Sea tracking towards Brest 997 mb by noon. The afternoon was better and suitable for walking with glimpses of weak sunshine, but cold maximum 5.5C (Writtle 14.1C Lo Max Balmoral -0.2C Min Kinbrace -2.9C Capel Curig 24.8 mm Dundrennan 4.7h Lake Vyrnwy 0.5h Valley 0.0h) [Max 5.5C Min 3.7C Rain 0.3 mm].

A nice winter's day had to come along sometime. The 10th was a nice day after some clear overnight sky leading to a ground frost (-1.6) some cold rain then a rapid clearance at 0900 GMT. Our resident mistle thrush was singing closeby; visibility poor to moderate, fog was lingering in the Menai Strait. Pressure 1024 mb was rising in a ridge from the Azores. Low 959 mb was S of Iceland and isobars were tightening to the north-west. Improved visibility and strengthening WSW'ly wind in the afternoon, sunny, fresh snow seen on the Snowdonia Mountains (Scilly 10.9C Braemar -7.9C Dunstaffnage 20.8 mm Wittering 6.0h Aberporth 5.0h Valley 4.2h) [Max 9.7C Min 2.3C Grass -1.6C Rain 0.4 mm]. Heavy rainfall in Wales on the 11 January 2020.Things got rather rough after midnight on the 11th with Valley reporting gales from 04 to 06 GMT and 09 GMT. The obs were fun, my hard hat was employed, visibility very poor and it was raining - the observer did not linger. Gusts of 42 mph here, 49 mph at Gorddinog, 58 mph at Gorwel Heights, 54 mph at Capel Curig and 61 mph at Aberdaron. Pressure 1014 mb was falling with Icelandic low 951 mb and southern highs 1035 mb Iberia and SE Europe centreed near near Verona, isobars were tight to the NW of here. AWS rainfall record 24h to 09 GMT on the 12th.We were in warm sector air before a cold front over the North Channel reached us. Wind and rain kept on all day, here gusting to 53 mph coinciding with torrential rain 16 mm/h (more intense in Llanfairfechan, Gorwel Heights 51 mm/h and Gorddinog 84 mm/h) 1520-1536 GMT as the cold front arrived. The temperature that had reached 10.6C at 1602 GMT fell with the barometer bottoming out at 1011 mb and wind speed moderating. There was another spell of moderate to heavy (29 mm/h 2213 GMT) rain here from 20 GMT to midnight. Rainfall in the 24h from 0900 GMT was 32.5 mm. Wales seemed to have the some of the best and worst of the weather today [Hawarden 13.9C Gorwel Heights 13.1C Min Tredegar 5.0C Capel Curig 62.6 mm Shap 43.2 mm Llansadwrn 32.5 mm Sennybridge 32.2 mm Lake Vyrnwy 21.0 mm Mona 17.8 mm Aberdaron 10.0 mm Valley 9.6 mm Rhyl 6.6 mm Hawarden 2.2 mm Sunless day] [Max 10.6C Min 3.4C Rain 32.5 mm].

The weather was quieter after midnight on the 12th and by morning the sky was starting to clear. The wind had dropped to force 3 and visibility was good with the cloud lifting. The ground was very wet indeed with pools of water here and there including on fields and farm gateways. Pressure was 1014 mb; and still high 1036 Iberia while complex low 958 mb was near Iceland. Brighter weather with some sunny spells developed by 1030 GMT with 2.4h of sunshine at RAF Valley. We were not out bad weather yet, a potentially damaging depression was developing rapidly 994 mb S Greenland and named Storm Brendan by the Irish Met Service (Met Éireann) who expected it to reach W of Ireland tomorrow, had deepened to 952 mb by midnight (Hurn 12.4C Aboyne -4.2C Cardiff 19.2 mm Katesbridge 5.6h) [Max 7.7C Min 5.5C Rain 0.3 mm]. Tweet about Storm Brendan.The 13th dawned with a S'ly force 5/6 wind and pressure 1002 mb dropping rapidly. Storm Brendan was deepening 948 mb W Northern Ireland at 0900 GMT then tracking N was 941 mb W of Scotland at 1800 GMT. South-west Ireland bore the brunt of the storm; Roches Point at the entrance to Cork Harbour recorded a gust of 84 mph. The wind strengthened here during the morning average gust speed from 1230 GMT to 1540 GMT was 43 mph, there were spots of rain from 1300 GMT. Between 1520 and 1550 GMT things got lively as the line front past over with heavy rain and ice pellets (falling at a rate up to 54 mm/h) blowing on the strong wind, highest gust 53 mph before moderating quickly. The hail covering the ground and greenhouse glass. Gorddinog reported a peak gust of 57 mph, Gorwel Heights 59 mph, Valley 65 mph, Mona 66 mph, Capel Curig/ Mumbles Head 80 mph (Egham,Surrey 11.7C Topcliffe 0.2C Achnagart 27.2 mm Libanus 22.0 mm Shoeburyness 3.6h Hawarden 0.2h) [Max 9.3C Min 4.1C Pptn 14.2 mm].

The 14th the sky was overcast uniformly grey with moderate visibility, there was a lighter SW'ly breeze. With saturated soil the rain had pooled and roadsides were awash. Pressure 989 mb was falling with complex low 940 mb SE Iceland with another low developed off Brest was 981 mb Fastnet at noon and moved rapidly to be 979 mb over the North Sea off Hull at 1800 GMT. A cold day sunless day with light showery rain and drizzle throughout (Weybourne 14.6C Low Max Dalwhinnie 2.0C Mona 7.4C Min Dalwhinnie -0.1C Libanus 42.4 mm Kirkwall 4.7h Valley 0.0h) [Max 6.9C Min 4.2C Rain 17.2 mm]. An improvement on the 15th the sky clearing rapidly by morning. Windy in the west with gusts of 49 mph at Aberdaron and 62 mph at Malin Head during the morning. Pressure 998 mb was rising quickly as low 954 Iceland continued to fill. An occluded front lay to the NW over N Ireland and Scotland; a frontal band of cloud was over the English Channel clearing SE'wards. Between the two a welcome 6.1h of sunshine (Valley), most in the UK (Bournemouth 11.0C Dalwhinnie 0.3C Achnagart 45.2 mm Valley 6.1h) [Max 9.0C Min 4.8C Rain 0.4 mm].

The first 15-days of January 2019 were unusually dry with just 7.5 mm of rainfall . Not so this year with rainfall of 101.3 mm (102%) & [99%] of averages. Temperatures both years were similar and on the mild side. This year the mean was 6.6C [+1.5], last year 6.4C [+1.3] of average.

The morning of the 16th began fine and bright with just 4 oktas cloud cover. Visibility was very good an a little patch snow could be seen on Snowdon. Pressure 1007 mb was falling with a low 980 mb W of Ireland, there was a moderate to fresh SSE'ly breeze and cumulus clouds were towering over the mountains. Frontal cloud soon encroached off the Irish Sea and in warm air the temperature rose to 11.6C. Light rain began by noon and turned heavy at 1553 GMT and ceased by evening, returning before midnight. There was a burst of very heavy rain at 0446 GMT that fell at a rate up to 70 mm/h. Rainfall for the 24h [09-09 GMT] was 14.2 mm over 14 hours duration (Bude 13.1C Drumnadrochit 1.1C Tyndrum 26.8 mm Manston 2.7h Hawarden 0.1h) [Max 11.6C Min 5.0C Rain 24.2 mm] [Capel Curig 23.0 mm Mona 11.8 mm Valley 6.2 mm]. The 17th was a colder day with fresh snow on the mountains above 1800 ft and as a result Moel Eilio was doing its imitation of Mt. Fuji. A fall of snow pellets had been recorded by the hailometer. Pressure 1008 mb was rising again with yesterday's low 973 mb N of Scotland. The long cold front was lying over the North Sea, through France, Spain and S Portugal. Fine, but a bit dull with a cool WSW'ly breeze at first, sunny later (Santon Downham 10.6C Katesbridge -2.4C Achnagart 21.0 mm Swyddffynnon 16.0 mm Kinloss 5.5h Aberdaron 5.4h) [Max 7.5C Min 3.4C Pptn 0.5 mm].

Llansadwrn view towards Gadlys and the mountains on a sunny afternoon.

A fine frosty morning on the 18th with an extensive white frost on fields, grass minimum -4.5C and slight air frost -0.2C. Slight hoar frost with rime on the rim of the copper raingauge, there was ice on water, but the grassy ground was soft. It was calm with smoke rising vertically and there was low level mist and fog in the Menai Strait. Becoming rare these days a proper January morning with some sunshine later. Pressure 1028 mb was rising in a ridge from SE Europe, sunny most places except coastal mist and fog patches S coast of England (Scilly 9.3C Katesbridge -5.5C Bala -2.6C Altnaharra 9.0 mm East Malling 7.5h Valley 4.6h) [Max 7.1C Min -0.2C Grass -4.5C]. Another January morning on the 19th overnight the air minimum 0.7C and -4.0C on the grass the soil surface was frozen hard. Air frosts have become rarer, but we still get a fair number of ground frosts. Hoar on low vegetation and rime on raingauge. Most clear sky with very light SSE'ly air indicated by smoke drift, anemometer not turning. Pressure 1046 mb was rising with intense high 1044 mb Dublin. Very good visibility with inversion fog in the Menai Strait and a little mist at low levels, the snowline was 2500 ft on the Snowdonia Mountains. Fine and sunny (Stornoway 9.8C Lo Max Wellesbourne 1.5C Lo Min Topcliffe -6.8C Sennybridge -4.9C Lerwick 4.2 mm East Malling 8.1h Valley 4.2h) [Max 8.3C Min 0.7C Grass -4.0C Pptn nil]. The 20th began cloudier with 5 oktas cover at 0900 GMT, but it was decreasing. Not so cold overnight the air minimum 2.2C and -0.9C on the grass, but there was no frost left on the vegetation. Pressure was a high 1048.7 mb with 1049 mb centred on the Severn estuary and Sennybridge on a record 1050 mb. A sunny day (Altnaharra 12.3C Lo Max Llysdinam 3.0C Lo Min Yeovilton -4.8C Kinlochewe 2.6 mm Shobdon 7.6h Hawarden 7.1h Valley 6.1h) [Max 9.0C Min 2.2C Grass -0.9C Pptn trace].

A dusting of snow on Carnedd Llywelyn.

After three cold and frosty January days the 21st was a bit unusual. Pressure was on 1043 mb the centre moved to be off SW Ireland 1045 mb, intense high 1051 mb SE Europe, Verona. Moderate fog code 3 at 0900 GMT (fog code 2 is quite rare here, none last year). Sky overcast with drizzle persisted most of the day. Sea fog was general at noon N of Aberystwyth, Cardigan Bay, Irish Sea Isle of Man. Fog (hill) became thick code 1 at 16 GMT, less was reported in Llanfairfechan, but had cleared here by 2200 GMT (Aboyne 12.9C Benson -5.3C Resallach 13.0 mm Porthmadog 0.8 mm East Malling 8.4h St Athan 5.4h Valley nil]) [Max 7.6C Min 3.2C Grass -1.0C Rain 0.6 mm]. Unusual today to have fog code 2 on the 22nd at 0900 GMT with the sky obscured, it had been thicker after dawn; the Snowdonia mountaintops were in the clear. Pressure was on 1040 mb with high 1041 mb just off SW Ireland. The setting sun in fog at Gadlys. The jetstream was keeping well to the N around the high-pressure. The AWS temperature was 7.6C (dewpoint 7.0C) 96% RH; the dry and wet thermometers in the Stevenson screen read 7.6C, 100% RH. Soon it was a little brighter with some blue sky with some small cumulus clouds were visible overhead and later a foggy sun. Fog was dense in the Menai Strait between the bridges at 11 GMT. Fog began to decrease around noon, but returned later in the afternoon. The 14.5C maximum temperature at Aboyne today was just short of the 15.0C record at Llandudno for this day in 1960 (TORRO) (Aboyne 14.5C Lo Max Wych Cross 5.2C Lo Min Bournemouth -3.9C Resallach 8.0 mm Gogerddan 1.6 mm Morpeth Cockle Park 5.9h Valley 0.8h) [Max 9.6C Min 6.2C Pptn trace fog]. Another foggy day on the 23rd starting under mostly clear sky (3/8) with the sun rising above the mountains at 0843 GMT I recorded moderate low level fog increasing at 0900 GMT. The temperature was 5.1C (dewpoint 4.5C) 96% RH, the grass minimum thermometer was reading 0.0C, it was calm or variable light airs. Heavy dew and fog deposition, fine with weak sunshine in the fog. Mist or fog was reported in most places except NE Scotland where it was sunny. By 1030 GMT the fog had increased and was thick code 1 and by noon it was dense code 0 (Ravensworth 11.7C Topcliffe -1.7C Resallach 12.0 mm Lake Vyrnwy 0.6 mm Sheffield 6.2h Hawarden 4.4h) [Max 7.0C Min 4.6C Grass 0.0C Pptn 1.4 mm]. This pink Azalea has been in flower in the garden for a while.That's very unusual the fog was still with us on the 24th and it was dense code 0 at 0900 GMT with the sky obscured so that got a 9 in the cloud cover record. The temperature was 6.1C (dewpoint 5.6C) 97% RH, a light SW'ly breeze this morning and there was a fine drizzle too. A jet from RAF Valley passed over, could not see it, it was not foggy at Valley (METAR accessed EGOV 240920Z 29004KT 9999 FEW007 BKN013 OVC019 07/06 Q1023 TEMPO BKN019 RMK GRN TEMPO WHT). Mist had been reported all night and no fog since yesterday afternoon The low cloud fog persisted all morning, lifted a little by 1330 GMT with slight rain and drizzle and was then variable moderate to dense fog till evening. Pressure at 0900 GMT was 1024 mb with high 1025 mb over the Celtic Sea, there was a frontal cloud band was over the North Channel (Bridlington 11.4C Sennybridge -1.0C St Bees Head 3.8 mm Leconfield 5.9h Bala 1.0h Valley nil) [Max 6.7C Min 5.7C Rain 0.8 mm].

Enough of the fog and the 25th did not disappoint, moderate (misty) visibility, fine with a cool breeze despite being S'ly. At 0900 GMT pressure was on 1017 mb with low 968 mb SW Iceland. A trace deposit of mixed coloured dust was observed. There was a cold front lying to the NW of Malin Head. Temperature 5.8C (dewpoint 4.4C) 91% RH. Somewhat breezy around noon and there was slight rain at times. Another sunless day (Scilly 10.9C Valley 8.4C Leeming -0.5C Eskdalemuir 4.2 mm Whitechurch 1.6 mm Aberdeen 1.6h Valley nil) [Max 8.6C Min 5.6C Rain 1.8 mm]. The 26th was another dull sunless day. Starting with a blustery strong SSW'ly wind whipping up the waves around the coast. Pressure 1002 mb was falling quickly with low pressure 956 mb Greenland/ Iceland region and a cold front over the Irish Sea. The west was wet again while it was sunny in central England. The temperature here was 8.4C and struggled to 8,8C at 1026 GMT. Gorwel Heights had seen 10.1C at 0800 and Gorddinog 10.2 at 0930 GMT all maxima for the day. Thereafter the temperature dropped reaching a minimum 2.6C at 1845 GMT for 2 hours with a touch of ground frost before rising again. The soil was saturated, soggy and muddy. Showers developed before midnight with a heavy one at 2320 GMT with small hail (Exeter 10.9C Rhyl 10.0C Fyvie Castle 2.9C Achnagart 26.6 mm Whitechurch 14.0 mm Weybourne 3.0h Aberdaron 0.7h) [Max 8.4C Min 2.6C Grass -1.5C Rain 6.2 mm]. Showers after midnight, some with small hail 0058 GMT, interspersed with clear spells with bright stars shining. By the morning of the 27th the sky was mostly cloudy. At 0900 GMT pressure 997 mb was falling with a large complex low 960 mb SW Iceland encompassing the UK and the Bay of Biscay. Pressure was high 1027 mb over the Canary Islands. The snowline with 50% cover, or more, on the mountains was at 2750 ft with some (30% cover) as low as 2500 ft. Bright at times with a little sunshine and some spots of rain. Shower of snow pellets about 18 GMT (Scilly 10.2C Milford Haven 9.2C Aboyne -3.6C Tredegar 22.8 mm Morpeth Cockle Park 6.9h Hawarden 2.8h) [Max 7.2C Min 2.6C Grass -1.5C Rain 5.2 mm].

This pink flowering heather Erica ssp has been flowering in the garden since Christmas 2019.

Wintry showers overnight including both snow and ice pellets with some still remaining on the grass on the morning of the 28th. A fine morning with weak sunshine as the sun rose over the mountaintops. A light fall of snow had settled as low as 450 ft on the lower slopes of the Carneddau, but mostly above 1000 ft. Pressure 992 mb was rising, there was a cool SW'ly breeze, the air circulating from Polar Regions, the Denmark Strait and Norway, the result of a low 971 mb S Iceland and W Scotland. The temperature was 3.7C (dewpoint 1.8C) 87% RH. The western fringes had showers the result of packed marine convection to the north-west with frequent cumulonimbus, there was lightning recorded over Cumbria and NWS Ireland. Central England and the SE was mostly sunny (Scilly 8.8C Loch Glascarnoch -6.6C Dunstaffnage 20.6 mm Cardiff 11.0 mm East Malling 6.4h Hawarden 3.3h Valley 1.4h) [Max 5.8C Min 1.1C Grass -2.6C Pptn 0.8 mm]. Remnants of snow seen on Snowdon in the afternoon. A fine morning on the 29th with snow on the mountaintops of Snowdonia. Pressure was on 1007 mb and there was a moderate SW'ly breeze picking up giving a significant 4-degree wind chill at noon. Glimpses of sunshine then thicker cloud brought slight drizzle in the afternoon from 1500 GMT when it began to turn milder (Scilly 11.4C Fyvie Castle -3.2C Tulloch Bridge 41.6 mm Sennybridge 4.2 mm East Malling 7.2h St Athan 5.7h Valley 0.3h) [Max 9.1C Min 3.5C Grass -0.5C Rain 0.1 mm]. This dwarf white Rhododendron has recently started to flower in the garden.A mild, but breezy morning on the 30th with no overnight frost on the ground. The temperature at 0900 GMT was 9.0C rising from a minimum of 5.3C and was to reach 10.6C at 1126 GMT. Pressure 999 mb was falling with a low 972 mb off the Western Isles of Scotland, Tiree had had a gust of 46 mph. Another low mid-Atlantic 964 mb S of Greenland was heading our way helped along by the jetstream. It was bright with some sunshine in Conwy and brighter here mid-morning as the wind strengthening, mist and rain was prevalent in the NW and SW of Britain. At 1343 GMT the temperature had risen to 14.3C in Llanfairfechan at Gorwel Heights. This was a long way off the daily record of 17.2C recorded at Aber in 1929 (TORRO), but there for the breaking in view of the 17.4C recorded on the 7th of the month. Hill fog returned between 17 and 19 GMT (Exeter 14.4C Hawarden 13.8C Lo Max Baltasound 7.4C Lo Min Baltasound 0.4C Achnagart 36.4 mm Capel Curig 5.2 mm Thomastown 2.3h Hawarden 1.4h) [Max 10.6C Min 5.3C Rain 4.0 mm]. On the last day of the month the 31st, and sad final day the UK was a member of the European Union after 47-years, there were a few small snow patches and remnant cornices remaining on the highest mountain cliffs despite the mild temperatures. At 0900 GMT it was 9.4C after an air minimum of 6.4C and was to rise to 10.7C at 1321 GMT. The temperature at Gorwel heights had been 13.9C at 0620 GMT. With just a small amount of rain overnight there was standing water around and with near horizontal rain blowing across the fields on a force 6 SW'ly the observer got quite wet (Hawarden 14.2C Lo Max Baltasound 6.9C Lo Min Lentran 1.9C Achnagart 35.2 mm Capel Curig 25.2 mm Aberdeen 2.5h Hawarden 0.3C Valley nil) [Max 10.7C Min 6.4C Rain 7.2C].

The month ended with a total of 154.2 mm of rainfall [151%] of average largest since 2016, one of the 13th wettest in Llansadwrn since 1928. It had been mild the mean temperature 6.4C highest since 2016 and the 8th warmest in my records since 1979. A rather dull month, nearly half the number of days in the month were sunless.




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February 2020

February 1 - a fine breezy morning with the cloud beginning to clear after yesterday's rain and some sunshine developing, visibility was poor in haze. Pressure 998 mb was rising with low 959 mb Norwegian Sea extending a trough to N Scotland. High 1030 North Africa had a weak ridge to the south-west. The W had showers while central England, the E and SE were mostly sunny. The sky turned cloudier around noon and there was a little slight rain and drizzle at times in the afternoon (Charlwood 13.9C Baltasound 3.1C Kinlochewe 38.4 mm Capel Curig 9.4 mm Hawarden 6.6h) [Max 8.9C Min 7.2C Rain 5.4 mm]. The 2nd began dull and damp after some overnight rain. Dark-tailed red squirrel a regular visitor to the feeder.Cloud was hanging as low as 1500 ft on the north-facing slopes of the Snowdonia Mountains. Pressure 1002 mb was rising slowly as a low 979 mb W of Ireland tracking NNE, there was an occluded front over the Irish Sea. Bands of rain were affecting central Scotland and the SW Approaches. Breezy around the coast with Aberporth reporting gusts of 40 mph. The morning was fine, but the afternoon had a very fine drizzle at times under thick cloud (Charlwood 13.9C Aboyne -6.5C Lake Vyrnwy 28.6 mm Lerwick 4.8h) [Max 9.9C Min 5.3C Rain trace]. A fine, but again dull morning on the 3rd with rain showers in sight affecting the western end of the Snowdonia Mountain range. Soon some fine spots were felt on the force 3 WSW'ly. Pressure 1013 mb was rising with a low 978 mb between Iceland and Scotland being influenced by a high 1024 mb W FitzRoy. A frontal system was moving SE across the Irish Sea bringing showers to the western fringe was yet to reach E England that was sunny. Marine convection was packed the NW behind the front. Glimpses of sunshine with the showers arriving bringing rain and small hail (ice pellets) around 11 GMT and similar later in the afternoon around 14 GMT. Slight snow was seen settled on the mountains above 1750 ft, but disappeared later leaving some older surviving snow patches (Heathrow 12.0C Aboyne -1.8C Achnagart 29.0 mm Lake Vyrnwy 14.4 mm Morpeth Cockle Park 7.2h Valley 1.4h) [Max 7.5C 5.6C Rain 0.6 mm]. Overcast sky once more, but today the 4th a gentle NW'ly. The cloud was fairly thin with some layering few clouds at low, scattered at moderate altitude, overcast above. Pressure 1023 mb was rising with high W of Brest expected to move NE towards the SW Approaches while low 995 was over the N North Sea. Western areas had showery rain especially over the mountains, otherwise dry with brief sunny spells was the order of the day (Carlisle 11.8C Dalwhinnie -0.4C Kinlochewe 10.4 mm Capel Curig 3.7 mm 6.5h Aberdaron 4.7h) [Max 8.4C Min 3.9C Grass -0.1C Rain trace]. Fairly cool overnight with an air minimum of 2.3C and a touch of ground frost (-0.9C). At 0900 GMT on the 5th the 7/8th cloud cover was allowing a little weak sunshine at times. Quite misty, or was it hazy, with only an outline of the mountains visible, technically as the RH was 94% it was haze and not mist. Pressure 1039 mb was continuing to rise with a high situated over the Severn Estuary near Swansea. Sunny spells had come along by 11 GMT, some fog lingered in England from the Thames to Merseyside (Chivenor 11.3C Cardiff 11.2C Aboyne -4.6C Dunstaffnage 2.8 mm Shoeburyness 6.8h St Athan 5.3h Valley 1.7h) [Max 8.9C Min 2.3C Grass -0.9C Pptn trace].

Hardly a cloud in the sky so it was a sunny morning on the 6th with pressure steady on 1032 mb. Pressure was high Europe centre near Verona 1040 mb. Out in the wings were low 991 mb Greenland deepening 975 mb and low 972 mb W of Ireland. There was silver frost on the grass and visibility was good; Snowdon had a light covering of snow/ ice on its NE flank and summit. There was just an air from the SW and soon the temperature was rising from a minimum of 1.3C to 9.8C at 13 GMT. On the sheltered rockery bank a buzzing was heard in the afternoon as several bees, the first of the season, were feeding on masses pink flowering heather (Erica). Valley reported 8.3h of sunshine. Mist and fog lingered in many parts of S Wales and central England (Aboyne 11.6C Gogerddan 10.4C Topcliffe -4.9C Lerwick 2.0 mm East Malling 9.2h) [Max 9.8C Min 1.3C Grass -2.9C Pptn nil]. The Foehn-enhanced temperature brought out the first bees of the year spotted on flowering heathers.The 7th proved to be an interesting day with rare low relative humidity values recorded both here and in Llanfairfechan. Cold dry air had descended and at Gorwel heights at 0623 GMT 15% RH with a low dewpoint of -15.6C at 0558 GMT was recorded. In Llansadwrn I recorded a low 30% RH and -11.7C dewpoint at 0706 GMT and David Lee 27% RH at 1012 GMT at Gorddinog. It was noticeable that surface leaf litter in the woods was dry. In a light SSE'ly the temperature here rose from a minimum of 0.4C to a Föhn-enhanced 11.4C at 13 GMT, 12.4C at Gorddinog AWS at 1340 GMT, but at Gorwel Heights it rose to 13.1C at 1310 GMT highest on this day. The UK highest recorded is 16.8C in Durham in 1993 (TORRO). Soil moisture determined today in Llansadwrn was 53.7% dry mass, lower that its 70% saturation point. Rain came along in the evening (Bridgefoot 12.2C Lo Max Dalwhinnie 4.3C Lo Min Aboyne -6.6C Machrihanish 2.8 mm Shap 7.4h Bala 3.3h Valley 3.0h) [Max 11.4C Min 0.4C Rain 2.9 mm]. Although there were some clear spells overnight the air minimum on the morning of the 8th was 4.5C and there had been no ground frost. At 0900 GMT the sky was turning cloudier and the SSW'ly was a blustery force 5. The Met Office had been issuing yellow warnings for wind and rain for some days about Storm Ciara that was on its way. Preparations for the likely closure of the Britannia Bridge at some point took place during the day. It began to rain during the afternoon and turned moderate to heavy, the wind strong to gale force from 15 GMT. A gust of 46 mph was recorded at 2020 GMT. At Gorwel Heights a gust of 85 mph was recorded at 2320 GMT, several properties received minor damage including removal of tiles/ slates. Capel Curig had a gust of 86 mph (Cardiff 12.1C Dalwhinnie 0.6C Tyndrum 39.0 mm Capel Curig 8.0 [75.0] mm Kinloss 6.8h St Athan 5.2h) [Max 11.1C Min 4.5C Rain 55.3 mm]. Heavy rainfall in Cumbria and N Wales on the 8 February  2020.The rain eased a little after midnight on the 9th, but not the wind. Just before 06 GMT as the wind strengthened again gusting to 57 mph and there was a torrential downpour of ice pellets and rain of 60 mm/h at 0625 GMT. At 0632 GMT thunder was heard and the electricity supply momentarily failed. Sferics were recorded over much of North Wales at the time Sferics at 0732z on 9 Feb 2020. Courtesy of blitzortung.org/. . At Gorwel Heights a gust of 62 mph was recorded at 0730 GMT. Storm Ciara closes Llansadwrn road with fallen tree and BT cable.A 57 mph gust of wind was recorded here at 0826 GMT. The wind brought down a tree across the road between Gadlys and the Church and with it the BT cable supplying phones and internet to six properties. This occurred just beyond the pole supplying the weather station house whose communications held. Conditions at 0900 GMT were atrocious in wind and rain. Pressure 976 mb was falling quickly and the temperature in the warm moist air was 11.1C, rainfall for the 24-h ending 09 GMT was [55.3 mm] largest of the month. It was also the 9th largest daily fall in any month in records at this station. Apart from a 69.1 mm in 1981 all are in in the 21st century, a clear indication of a changing climate. Capel Curig reported [75.0 mm] and Shap Fell in Cumbria 88.0 mm. The Britannia Bridge was closed for a while and a landslide closed the A5 at Llyn Ogwen. At 10 GMT wind turbines were supplying 43% of the UK electricity demand. During the afternoon wind started to moderate and rain gave way to showers with glimpses of sunshine. There was flooding in the Conwy Valley and Llanwrst, the railway line to Ffestiniog was affected and closed. The wind was picking up again before midnight. The run of wind 00-00z in Llansadwrn today was 450 miles and at Gorwel Heights 305 miles (Donna Nook 14.8C Hawarden 14.6C Tulloch Bridge 0.0C Capel Curig 122.6 mm Leuchars 4.7h Valley 2.1h) [Max 11.4C Min 5.9C Rain 7.8 mm] [Capel Curig 54.4 mm Bala 34.2 mm Rhyl 26.6 mm].

Wild wallflower flowering in the garden today. The 10th began fine, bright and blustery the WSW'ly force 6 and strengthening convective clouds building. Strong gusts over the mountains with Capel Curig reporting 64 mph. Sunny spells gave way to some weak sunshine as cloud developed. Pressure 994 mb had risen with low 943 mb Iceland. Ciara had moved over to Norway while pressure remained high 1036 mb Tunisia and 1035 mb E Mediterranean. Glimpses of sunshine around noon then it turned showery and at 1520 GMT we had a shower of snow pellets and small flaked snow. The native wallflower flowering today in the garden (right) is a bright golden yellow and survives on very little soil including the walls of Beaumaris Castle (Scilly 10.7C Lo Max Salsburgh 0.8C Lo Min Dalwhinnie -0.7C Millport 25.6 mm Bala 13.2 mm Aberdeen 7.2h) [Max 6.2C Min 3.6C Pptn 1.8 mm]. SKIRON Graphic courtesy of the University of Athens.On the 11th pressure 1003 mb was still rising with low-pressure to the N low 963 mb part of an Icelandic. Norwegian complex was N Scotland. The cold air upon us today was coming all the way across the Atlantic from the Canadian Arctic. It was breezy with cumulus clouds increasing we had been having snow pellet showers and some were lying on the ground. At 0900 GMT another shower of snow pellets the temperature 3.3C (dewpoint -0.2C) and 78% relative humidity. With some sunshine at times it was a blustery morning with a wind chill of -2C and poor visibility. Sferics were recorded to the N and S of here and near Dublin, but none near here (Shoreham 8.8C Altnahinch Filters -0.9C Cassley 30.8 mm Cardiff 3.2 mm East Malling 8.7h Aberdaron 6.7h Valley 4.4h) [Max 5.9C Min 2.2C Pptn 0.3 mm]. Tweet about winter flowering hellebores in the garden.There was a cold W'ly breeze on the morning of the 12th the airflow still from the Canadian Arctic. There had been slight shower(s) of snow pellets since midnight, but there was none on the ground. Pressure 1013 mb was rising with a high 1028 mb over the Charente Maritime, France, Atlantic-low 985 mb was W of the Scilly Islands. Most of southern Britain was sunny with cumulonimbus clouds and with the threat of showers W & NW Ireland and Scotland. Bright at first with snow seen on the Snowdonia Mountains as low as 1750 ft in places including Moel Eilio. Cloudy in the late afternoon with some fine drizzle (Scilly 9.7C Killylane -1.1C Cassley 39.2 mm Tredegar 4.2 mm Wattisham 8.3h Hawarden 6.7h Valley 6.3h) [Max 7.4C Min 2.1C Grass -2.0C Pptn 3.0 mm]. Breezy overnight and showery rain early on the 13th and moderate shower at 0900 GMT with puddles forming on the water saturated ground. Pressure 987 mb had fallen the result of low 983 mb N Ireland, but named Storm Dennis S of Greenland was undergoing rapid cyclogenesis 952 mb. Gales were occurring SW Cornwall and Scilly Islands with a gust of 64 mph experienced at Cardinham. The wind here had moderated, rainfall amounts were large in Llanfairfechan and over the Snowdonia Mountains (xx Cardiff 10.6C xx Tredegar 1.8C xx Libanus 30.2 mm xx St Athan 3.7h) [Max 8.2C Min 2.8C Grass -1.3C Rain 0.4].

The effects of Storm Dennis began to arrive on the 14th with pressure 1008 mb falling rapidly at 0900 GMT. Dennis was 933 mb SW Iceland and expected to deepen to about 922 mb making it one of the deepest over the North Atlantic in 30-years. The SSW'ly wind was blowing force 7/8 on the exposed side of the Llansadwrn ridge, Capel Curig had reported a gust of 66 mph. A little brightness at first, a glimpse of sunshine the weak sunshine as the cloud on a frontal system over the Irish Sea bringing a band of moderate to heavy rain and rising temperature. Rain ceased in the afternoon as the wind moderated, the temperature rose to 10.7C here and to 11.6C at Gorwel Heights in the warmer air (Murlough 12.7C Gorwel Heights 12.3C Rhyl 11.7C Loch Glascarnoch -9.1C Braemar 20.6 mm Capel Curig 14.2 mm East Malling 6.0h) [Max 10.7C Min 2.8C Grass -1.5C Rain 6.4 mm]. Tidal elevations at Llandudno courtesy of UK National Tide Guage Network accessed 20/02/20. The 15th was overcast and dull with rain at 0900 GMT. Pressure 996 mb was falling with the Dennis complex low system 931 mb W of Scotland. The temperature was 10.7C (dewpoint 9.1C) 90% RH, rising to 11.1C late afternoon, the SW'ly force 6 and moderate visibility. The temperature at Gorwel heights at 0840 GMT was 12.3C. The rain turned moderate to heavy (17 mm/h at 1118 GMT) through the morning, was lighter in the afternoon when pressure reached its lowest 982 mb at 1720 GMT, with a lull in the evening before returning again moderate to heavy before midnight. The low pressure system resulted in a surge on the high tide at Llandudno of about 0.8 m late afternoon contributing to flooding of the River Conwy (courtesy of the UK National Tide Gauge Network). There was flooding of homes and businesses in several parts of Wales, Conwy Valley and South Wales valleys (Wellesbourne 13.9C Kielder Castle -0.4C Shap Fell 63.2 mm Tredegar 59.0 mm Thomastown 0.6h) [Max 11.1C Min 6.7C Rain 28.6 mm].

Pressure associated with Storm Dennis S Iceland at midnight on the 16th was 923 mb and was falling again in Llansadwrn 982 mb reaching 981 mb at 03 GMT when the wind was gusting 45 mph. Tweet about Storm Dennis large hail. Photos courtesy of Gordon Perkins.At 0900 GMT it was 985 mb and rising and it had stopped raining.Run of wind 00-00z in Llansadwrn 12-18 february 2020. Rainfall in the past 24-h was 28.6 mm. Llyn Tegid at Bala had overflowed again and was covering the car park at the Visitor Centre. Strong winds again in the NW with South Uist reporting a gust of 70 mph at 10 GMT. The afternoon turned showery as a trough passed over North Wales producing some large hail up to 8-9 mm here, but at Gorwel Heights Gordon Perkins photographed hail stones of 2 cm diameter that fell covering the ground and the A55 near Llanfairfechan causing problems for passing traffic, and along the coast towards Queensferry where later there was heavy sleet. The surge on the high tides at Llandudno today were about 0.6 m (courtesy of the UK National Tide Gauge Network). The run of wind 00-00z in Llansadwrn today was 450 miles and at Gorwel Heights 302 miles(East Malling 13.0C Dalwhinnie -0.2C Tredegar 62.6 mm Aberdeen 6.7h) [Max 8.4C Min 6.1C Pptn 0.3 mm].Winter heliotrope in flower. It had been very windy overnight gusting 48 mph at 0114 GMT and in the morning of the 17th the sky had been clearing leaving a line of cumulus clouds over the mountaintops. At 0900 GMT pressure 1001 mb was rising but clouds were increasing, there was a moderate to strong SW'ly and the ground was drying. Visibility was poor in haze and there was some mostly weak sunshine at times in the morning becoming sunny in the afternoon spoiled by a shower of rain and small ice pellets at 1540 GMT. The winter heliotrope (Petasites fragrans) is in flower now. It has mauve-pink scented flowers (right) above a carpet of rounded leaves 20-30 cm high that persist until late autumn. Native to southern Europe naturalised in Britain where only male plants are found, spreads by rhizomes, is shade tolerant and can be invasive (Wisley 11.7C Dalwhinnie 1.0C Tyndrum 44.8 mm Usk 8.2 mm Aberdeen 8.8h Valley 5.7h) [Max 9.5C Min 5.3C Pptn 0.2 mm]. It was fair overnight with no precipitation, some clear spells with a grass minimum of -0.5C during the early evening. The morning of the 18th was fine and breezy with a moderato to strong SW'ly. Pressure 1014 mb was falling with low 971 mb (ex Dennis) mid Norwegian coast. Another low 979 mb was SE Iceland. Cloudier from 10 GMT with spits and spots of rain. More showery in the afternoon with 4-5 mm ice pellets at times (Heathrow 11.4C Dalwhinnie 0.2C Kinlochewe 24.8 mm Sennybridge 13.2 mm Aberdeen 6.4h) [Max 7.9 Min 4.1C Grass -0.5C Pptn 1.2 mm].

A dry night and overcast morning on the 19th and just starting to rain at 0900 GMT. Pressure 1018 mb was falling, there was an area of rain encroaching on a warm front from the Atlantic to the SW associated with low 957 mb S Iceland. The temperature in the warm moist tropical air rose through the day reaching 8.6C by 19 GMT. The day was sunless, continuous rain was light to moderate and, with little change in the air temperature, turned moderate to heavy before midnight (Scilly 11.1C Baltasound -1.8C Capel Curig 36.2 [62.2] mm Weybourne 5.8h) [Max 8.8C Min 5.0C Grass 3.1C Rain 42.0 mm]. New kid on the tree this winter coated red squirrel with very long ear tufts.After midnight on the 20th it was windy with gusts of 38 mph, the rain continued and was intermittently moderate to heavy. At 0700 GMT the temperature had risen to 8.8C as the cold front arrived the wind moderated. There was a burst of very heavy rain and ice pellets at 0849 GMT falling at a rate up to 44 mm/h. There was much standing water and runoff from fields with local roads awash. At 0900 GMT still raining heavily pressure 1002 mb was rising quickly. The morning soon cleared up and by afternoon it was sunny. A shower of rain and ice pellets fell at 1530 GMT then cleared to sunny again (Bridlington 12.2C Loch Glascarnoch 0.2C Shap 50.4 mm Capel Curig 49.8 mm Kinloss 5.0h Aberdaron 4.8h) [Max 8.1C Min 2.8C Grass -0.5C Pptn 2.6 mm]. The wind gradually strengthened overnight and by the morning of the 21st it was blowing half a gale with gusts of 42 mph. There were spots of rain of rain on the wind and serious rain began soon after 0900 GMT. Pressure 1015 mb was falling with complex Icelandic low 956 mb with associated triple point near the Western Isles of Scotland. We were in warm sector air the 8.1C temperature warmest of the last 24h. The Met Office issued a yellow rain warning for mountain areas of N Wales at 1050 GMT. Light rain through the morning turned moderate by the afternoon. Llyn Tegid at Bala had overflowed onto the car park at the visitor centre again. Windy day gusts of 56 mph at Aberdaron and 52 mph at Lake Vyrnwy. Wet sunless day in Snowdonia and Anglesey (Fyvie Castle 13.5C Dalwhinnie 0.2C Tyndrum 61.6 mm Capel Curig 53.8 mm Aberdeen 5.5h Valley 0.0h) [Max 9.7C Min 2.8C Grass -0.5C Rain 18.8 mm].

After a rough night with gale-force winds another wet winter's day on the 22nd beginning dull with the WSW'ly wind picking up again. Pressure 1012 mb was rising quickly with low 948 mb NW Norwegian Sea and a very long frontal system stretching from the Baltic across S Britain to just N of the Azores, over 1000 miles. There were two cold fronts passing over Anglesey, the first clearing just before 08 GMT, and the second at 1555 GMT with heavy rain and ice pellets (38 mm/h) that caused the sharpest fall in temperature of the day. Malltraeth Marsh was flooded and there were big waves around the coast on the high tide. Winds reached force 9 around coasts and headlands and gusted to 74 mph at Malin Head (Heathrow 14.3C Braemar -0.6C Lake Vyrnwy 47.4 [48.0] mm [Capel Curig 35.2 mm] Aberdeen 7.0h St Athan 2.7h Valley 0.4h) [Max 8.3C Min 6.5C Pptn 26.4 mm]. A foggy morning on the 23rd at 0900 GMT moderate fog was lifting and the mistle thrush was singing. The ground after 26.4 mm of rain was very soggy and muddy, but pressure 1012 mb was rising quickly with low 989 mb N Scotland, there was a ridge to the W and high-pressure 1035 mb FitzRoy and Spain. Again there was a long frontal system from Finland over S Britain out to the western Atlantic Ocean. Slight rain at 0950 GMT then the sunny breaking through thinning cloud by 1020 GMT and a few sunny spells in the afternoon. Busy in the garden restaking Cistus and other plants blown over in recent gales. The 16.0C recorded at East Malling today was being headlined by the BBC as the highest temperature of the year so far, but we know better as 16.9C was recorded at Gorddinog and 17.4C at Gorwel Heights in Llanfairfechan on the 7th January (East Malling 16.0C Fyvie Castle -1.4C Lake Vyrnwy 44.6 mm Leuchars 8.2h Valley x) [Max 9.4C Min 5.6C Rain 19.2 mm]. The 24th began overcast and after recent rain visibility was very poor with mist. The temperature at 0900 GMT was 9.1C (dewpoint 8,6C) and relative humidity 95%. Blustery too the SW'ly force 6 with gusts 42 mph. Pressure 1001 mb was falling quickly. Llyn Tegid at Bala was deeply flooding the car park and there were waves blown in on the strong wind. Wind moderated during the evening, dry until after midnight (Coningsby 14.1C Hawarden 13.6C Tredegar 8.7C Dalwhinnie -3.3C Capel Curig 54.2 mm Leeming 3.6h Aberdaron 3.1h Valley x) [Max 9.8C Min 3.3C Rain 0.9 mm].

Another overcast morning on the 25th after rain falling after midnight. Pressure 999 mb was still falling with low 979 mb over the North Sea. There were shower troughs bringing marine convection onto W and NW facing coasts. There was some cloud on the mountaintops, but snow could be seen at 2150 ft near the Black Ladders on the Carneddau Mountains. Bright at times with glimpses of sunshine and a shower of 5 mm snow pellets at 1550 GMT.Tweet about wettest February on record. The rainfall total for the month has reached 223.7 mm already exceeding the largest falls in February in Llansadwrn at Treffos 196.1 mm and Gadlys Cottage 189.1 mm stations in 1958 (Frittenden 10.4C Cardiff 8.8C Tredegar 4.5C Braemar -6.2C Rochdale 19.6 mm St Athan 10.8 mm Aberdeen 7.0h Hawarden 4.1h Valley x) [Max 7.1C Min 2.3C Rain 1.6 mm]. A fine and cold morning on the 26th with snow on the Snowdonia Mountains as low as 1000 ft in places. At 0900 GMT the temperature was 3.7C RH 89% and the sky 6 oktas was starting to clear. Pressure 1005 mb was rising quickly with lows 986 mb N of Scotland and 979 mb Baltic. High 1026 mb was over Morocco and we were in a NW'ly airflow from Arctic regions W of Greenland. There were showers off Liverpool Bay passing through the Cheshire Gap. Blackthorn had started flowering in a few places including at Morrisons Supermarket in Bangor. We did not know it, but this was to be our last visit to Bangor shopping, and indeed the mainland, across the Menai Suspension Bridge for some considerable time, due to the coronavirus #COVID-19 outbreak #StayingAtHome. A fine sunny and dry day (Cardiff 10.1C Lo Max Lake Vyrnwy 3.3C Dalwhinnie 1.6C Braemar -5.1C Tredegar -0.2C Leek 13.9 mm Capel Curig 11.0 mm Boulmer 9.3h St Athan 7.4h Valley x) [Max 7.7C Min 1.1C Grass -1.4C Pptn 0.7 mm]

A bright start on the 27th after some wintry showers (snow pellets) overnight with a clearing sky and a cool NNW'ly breeze, a bit chilly 2.9C, but nice to see the sunshine. Pressure 1003 mb was rising with low 987 mb over the English Channel bringing showers to Brittany, S England and Thanet. After 0900 GMT the sky did cloud over for a while before clearing again giving a fine mostly sunny day. Best in the west (Swanage 9.7C Valley 9.2C Lake Vyrnwy 4.8C, Drumnadrochit -4.0C Wych Cross 14.8 mm Morpeth CP 9.7h Valley 8.7h) [Max 8.0C Min 2.6C Grass -2.7C Pptn 1.2 mm]. Back to normal on the 28th with sky overcast, wet and cold. Pressure 998 mb was falling quickly and there was a light to moderate SSE'ly breeze. It was snowing on the Snowdonia Mountains with 'whiteout' on the lower slopes of the Carneddau below the Black Ladders. Storm Jorge MSLP at 1700 GMT on 29 Feb 2020. Courtesy of UQAM.It rained here moderately through the morning and the day was sunless. Further moderate to heavy rain in the evening and after midnight (Murlough 13.1C Hawarden 12.2C Lake Vyrnwy 8.6C, Tredegar -1.7C Benson -3.5C, Cardiff 50.6 mm Magilligan 1.9h Valley 0.0h ) [Max 10.2C Min 3.3C Grass -2.6C Rain 23.2 mm]. Being leap year we had an extra day, the 29th. A bright morning with very good visibility and 5 oktas of cumulus cloud cover, a moderate WSW'ly wind. Pressure was steady on 979 mb with a low 963 mb W of Malin Head and Storm Jorge 954 mb Western Isles at midnight tonight. Gales in the afternoon, cloudy, but not much in the way of precipitation. Gusts here of 49 mph at 1634 GMT and 52 mph at 1705 GMT. Mace Head reported a gust of 83 mph and Aberdaron 52 mph. There was a cold front over central England, Biscay and Iberia, sferics were observed over mid Wales. Wet in Scotland and South Wales, Llyn Tegid had overflowed again (Heathrow 9.8C Pembrey Sands 8.1C, Balmoral -1.0C Eskdalemuir 40.0 mm Tredegar 32.6 mm Camborne 6.2h Aberdaron 5.7h) [Max 6.9C Min 3.4C Grass -0.3C Pptn 0.2 mm].

The month ended with a record total rainfall of 250.6 mm (304%) & [319%] of average largest since before 1979 at this station and before 1928 in Llansadwrn. It had been mild generally the mean temperature 6.3C lowest since 2018, but 12th warmest in my records since 1979.




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March 2020

#StayingAtHome

March 1 - a fine morning with a cold WSW'ly wind it had been bright with some glimpses of sunshine, but recently cloud had begun to increase. Pressure 983 mb was rising with lows 958 mb N Scotland and 993 mb Biscay. Pressure was high 1023 mb over Russia and we were in a showery Polar/ maritime airflow from the region of Greenland. There was some snow on the highest mountain summits in Snowdonia. Some weak sunshine and glimpses of bright sunshine in the afternoon, a slight shower of rain at 1545 GMT then a shower of 6 mm hail at 1628 GMT (Kew Gardens 11.1C Loch Glascarnoch -0.3C Kielder Castle 25.2 mm Manston 9.0h Aberdaron 8.8h) [Max 7.2C Min 3/4C Rain 1.4 mm). The sky was clear overnight at times and early on the 2nd with a moderate ground frost -5.0C, but soon began to cloud over at 0900 GMT 5 oktas cover and increasing soon weak sunshine at times. Pressure 988.6 mb was rising quickly and we were in a polar/ maritime airflow with packed marine convection to the north-west. There was a shower of small ice pellets at 0925 GMT. Mostly cloudy, but dry in the afternoon (St James Park 10.9C Cardiff 10.1C Coningsby -3.1C Kinlochewe 18.4 mm St Athan 9.0 mm Aberdaron 9.2h) [Max 7.1C Min 0.2C Grass -5.0C Rain 2.2 mm]. Rain light to moderate in the small hours of the 3rd with a heavy burst at 0212 GMT that included some ice pellets. At 0900 GMT the sky was brightening in a light W'ly breeze and it was sunny later. Snow showers on the mountains. A sunny afternoon and warm enough for bees to be on the flowering heather rockery banks, and nice enough for a cup of tea to be taken in a sheltered spot. Best in the west today (Cardiff 11.7C Shoreham -2.5C Loch Glascarnoch 11.2 mm Capel Curig 7.8 mm Aberdaron 9.1h) [10.6C Min 3.6C Grass -1.6C Rain trace]. A dull morning on the 4th with slight intermittent rain beginning, precipitation was of snow at 2000 ft on the Snowdonia Mountains where there was lying snow at 2500 ft. Pressure was steady on 1007 mb with a low 1000 mb near the Fastnet Rock, S Ireland, and an occluded front over the Celtic Sea. Low 974 was over the Denmark Strait with marine convection to the north-west of here. The rain did not come to much and the afternoon was cloudy, but dry. Able to do work outside , but no bees and no cup of tea [Max 7.6C Min 2.0C Grass -3.6C Rain 0.4 mm]. Another ground frost overnight -3.0C with slight frost remaining on the grass on the 5th at 0900 GMT. Pressure 1001 mb was steady with low 987 mb Brest, 991 mb W of Malin Head and 984 mb SW Iceland. We were benefiting from a minor ridge N Irish Sea with pressure high 1035 mb Azores. The air minimum had been down to 1.0C, so no air frost so far this month. Cloud cover at 6 oktas a few cumuli increasing, moderate hazy visibility. A fine morning with a light E'ly breeze and some weak sunshine and occasional glimpses, becoming sunny in the afternoon and nice enough for a cup of tea. Best in the west (Porthmadog 10.8C Katesbridge -5.9C Mona -0.5C Herstmonceux 36.2 mm Leeming 8.9h Aberdaron 8.6h) [Max 8.6C Min 1.0C Grass -3.0C Rain nil].

Sprinkling of snow on the Carneddau Mountains, Wales.

Another cold night with an indicated ground frost minimum -4.7C, but no sign of white frost on the grass on the morning of the 6th at 0900 GMT. The summit of Snowdon had a covering of snow and frost deposition and there was gully snow on several mountain cliffs.A covering of snow on Yr Wyddfa. No rain, but the ground was still soft underfoot. Pressure 1004 mb was rising with low 992 mb Malin Head and an occluded front N Channel and Anglesey. A fine morning mostly cloudy morning with a light SW'ly breeze and moderate visibility. Mostly cloudy with some slight rain or drizzle in the afternoon. Best weather in Cheshire and Merseyside (Nantwich 11.2C Altnaharra -7.3C Bala -3.7C Culdrose 7.4 mm Milford Haven 4.4 mm Morecambe 9.6h Hawarden 6.3h) [Max 10.0C Min 0.4C Grass -4.7C Rain 0.1 mm]. Dull and overcast on the 7th with fine misty drizzle. There had been slight snowfall on the mountains in the early hours. Pressure was on 1011 mb with low 967 mb SE Greenland and a warm front running along the spine of Britain. We had warm most air from tropical regions. It was an inside day today and watched the rugby match Wales narrowly losing to England which was to be the last match played for the season due to the spread of the coronavirus epidemic. With strengthening SW'ly wind gusting to 41 mph there was a spell of moderate to heavy rain from 1930 GMT in the evening. Wet and warm in the north (Kinloss 13.9C Hawarden 14.4C Santon Downham -3.1C Achnagart 75.0 mm Capel Curig 8.0 mm Shoeburyness 3.9h Hawarden 1.5h) [Max 19.7C Min 3.5C Grass -1.8C Rain 10.6 mm]. Rain continued after midnight eased then a final heavy shower at 0334 GMT. At 0900 GMT on the 8th the sky had started to clear in a moderate to strong SW'ly. The rain was sufficient to make the ground soft and muddy again. Pressure 1000 mb was rising with low 973 SE Iceland while pressure was high 1029 mb over the Atlantic W of Gibraltar Strait. The jetstream was meandering S of Britain via the Gulf of Mexico and the Canadian Arctic. Shower troughs were in the vicinity and the day was mostly cloudy with sunny spells in one, at 1340 GMT, the temperature rose briefly to 10.3C. Otherwise in the wind it was pretty cold working in the garden, but I did sow some lettuce seeds in the greenhouse (Heathrow 14.3C Hawarden 11.8C Dalwhinnie 1.7C Capel Curig 35.4 mm Lyneham 7.1h) [Max 10.3C Min 6.3C Grass 2.8C Rain 0.4 mm]. On the 9th there was a little snow on the Snowdonia summits especially Snowdon. Just a touch of ground frost overnight with the sky turning cloudier at 0900 GMT. Pressure was on 1012 mb with a minor ridge over the Irish Sea declining as a low 973 S of Greenland began to move in from the west. It was a dull day with a glimpse of sunshine in the morning and a cloudy wet afternoon from 13 GMT moderate then heavy till 18 GMT (Murlough 12.3C Hawarden 11.6C Aboyne -3.1C Derrylin Cornahoule 27.6 mm Lake Vyrnwy 25.0 mm Kirkwall 6.5h) [Max 9.9C Min 4.8C Grass -0.4C Rain 13.8 mm]. A similar dull and breezy day on the 10th, mild overnight the air minimum 5.6C and no ground frost. Moderate (low cloud) fog at 0900 GMT, the temperature 9.4C and 95% RH. A blustery morning with gusts of 35 mph here, 54 mph at Lake Vyrnwy and 48 at Capel Curig. The jet stream was set up over the UK with low 966 mb SW Iceland and cold fronts over the Irish Sea. The temperature rose to 11.0C at 1514 GMT the fell fairly quickly, but it kept dry. Wet in South Wales (Monks Wood 16.5C Usk 14.0C Aboyne -0.9C Sennybridge 26.0 mm Dyce 5.8h) [Max 11.0C Min 5.6C Grass 4.8C Rain 0.2 mm]

A fine and bright, but blustery morning on the 11th after a windy night. Winds were strong in the N and gusting 54 mph in Scotland. It was sunny in the E and East Anglia. Pressure was on 1006 mb with low 959 mb Greenland and a low-pressure area Iceland and N Scotland 972 mb. An occlusion was over the Irish Sea we had showery rain in the morning (10.2 mm/h at 1121 GMT), a mostly cloudy afternoon with the wind strengthening and heavy showers again in the evening (19.6 mm/h at 1940 GMT). The sky cleared later and overnight with the moon visible (Heathrow 15.4C Cardiff 13.9C Aberdeen -0.9C Shap 23.2 mm Capel Curig 12.4 mm Aberdeen 8.5h Aberdaron 4.3h) [Max 9.7C Min 4.7C Grass -1.4C Rain 3.2 mm]. A fine morning on the 12th becoming breezy again. Overnight an air minimum of 2.8C and -2.1C on the grass. Winds were strong in the west with 60 mph seen at Belmullet Head, Ireland, and there had been heavy snow in Tulloch Bridge, Scotland. We had a polar/ maritime air flow today with pressure on 1005 mb there was a low 979 mb near the Western isles with an occlusion near Malin Head. Bright, dry and windy morning and noon turning showery with sunny spells in the afternoon. There was a shower of rain and ice pellets at 1919 GMT (Coningsby 12.0C Dalwhinnie -1.5C Tulloch Bridge 29.4 mm Lake Vyrnwy 7.6 mm Shoeburyness 9.7h Hawarden 7.5h) [Max 8.7C Min 2.8C Grass -2.1C Rain 2.0 mm]. A mostly cloudy morning on the 13th with slight showers before 0900 GMT. It was not so breezy with a light W'ly, moderate visibility and the temperature 6.9C. Pressure 1017 mb was rising with Atlantic-low 1003 mb W of Shannon and an occlusion over the Irish sea. Mostly dull and grey with a little sunshine and light showers of rain in the afternoon not heavy enough to stop work in the garden (Pershore College 13.4C Cardiff 13.0C Katesbridge -2.4C Camborne 11.0 mm Scolton 8.6 mm Loch Glascarnoch 8.6h Aberdaron 4.7h) [Max 9.1C Min 4.1C Grass 0.1C Rain 2.0 mm]. Much the same on the 14th, a little warmer 8.1C at 0900 GMT and mostly cloudy. Recent light showers of rain and poor visibility and another shower at 0930 GMT. Pressure was on 1010 mb with lows 992 mb S Iceland and W of Shannon with an occlusion over the Irish Sea (sound familiar?). The odd glimpse of sunshine (643 W m -2 1139 GMT) otherwise dull with intermittent rain and heavy rain later (16 mm/h at 1957 GMT). Wet in Snowdonia (Northolt 13.9C Kinlochewe -1.2C Capel Curig 23.2 mm Altnaharra 3.2h Valley 2.2h() [Max 10.5C Min 3.7C Grass -1.3C Rain 13.2 mm]. The band of rain overnight was heavy between 0300 and 0330 GMT had passed over and was over SW England, the Midlands and the Wash. A very dull and damp morning on the 15th the ground after 13.2 mm of rain very soggy underfoot. Overcast and cold in the strong SW'ly wind, moderate visibility. Pressure 1002 mb was rising and the cloud thinning at times allowed a little weak sunshine in the morning and glimpses of sunshine in the dry afternoon. Wet in Snowdonia again (Gosport 13.0C Cassley 1.1C Capel Curig 38.0 mm Thomastown 6.9h Valley 5.4h) [Max 11.0C Min 6.5C Grass 4.4C Pptn trace].

The first 15-days of the month had rainfall of 49.9 mm (60%) & [58%] of averages. Temperatures were on the cool side with the mean 6.5C (-0.3) & [-0.5]. No air frosts, but the had been 5 ground frosts.

The 16th had been clear overnight and, while there was no air frost, there was a moderate ground frost the thermometer reading -4.3C. Measured frost deposition was equivalent to 0.5 mm of precipitation. In the garden a mass of Chinodoxa 'Glory of the snow' was in flower, no snow this year for it, just a frost. Pressure 1021 mb was rising with a ridge of high-pressure to the SW from Azores high 1031 mb. Broken clouds with bright spells in the morning, bees were seen out briefly, increased in the afternoon and turning cooler in a freshening SW'ly breeze,. There was rain later in the evening (Frittenden 13.8C Aboyne -7.6C Achnagart 22.8 mm Capel Curig 3.8 mm Lyneham 10.5h Hawarden 8.2h Valley 6.0h) [Max 9.4C Min 1.3C Grass -4.3C Rain 13.2 mm]. Light rain continued after midnight on the 17th with moderate bursts at 0130 and 0500 GMT, by morning 13.2 mm had fallen. Precipitation had also been as rain on the Snowdonia Mountains so, apart from surviving snow patches, the summits were snowfree. At 0900 GMT there was thick fog (code 1) and the trees here were imitating a rain forest, drip drip drip. Underfoot the ground was soft and muddy, conditions were dull and dismal. Topped up the squirrel feeding boxes as at the present time they are removing about a litre of monkey nuts and some hazel nuts a day. Some they eat, others they take away and bury. Maybe they will not go back to find all the hazel nuts and they will germinate and produce saplings. I've not seen any yet, of the monkey nuts, who knows? A frontal system was over St George's Channel and Wales all associated with complex low 975 Iceland. With pressure steady on 1023 mb it was becoming brighter at 0945 GMT, the SSW'ly was force 4/5 and strengthening. A sunless day with rain and strong SW'ly wind gusting to 41 mph at 2135 GMT, rain moderate to heavy at times (Santon Downham 15.9C Alice Holt Lodge 0.4C Eskdalemuir 27.2 mm Capel Curig 27.0 mm East Malling 9.0h Hawarden 1.8h Valley nil) [Max 10.7C Min 6.8C Rain 22.2 mm]. Rain continued after midnight, but the wind moderated. By morning 22.2 mm of rain had fallen in the past 24h (09-09 GMT). This time the rain on a cold front (lying Pembrokeshire to the Wash at 06 GMT) turned to snow on the mountaintops and there was some wet snow lying at 2700 ft. A dull, cold and sunless day the maximum temperature today was 6.7C, the lowest of the month (St James Park 16.0C Usk 11.8C, Pennerley 4.7C Lake Vyrnwy 5.5C, Fyvie Castle -0.5C Lake Vyrnwy 3.4C, Capel Curig 21.6 mm, Kinloss 9.4h Valley nil) [Max 6.7C Min 4.7C Rain 22.2 mm]. The 19th dawned brighter with the sky clearing and pressure 1029 mb rising, cool overnight minimum 2.9C with a ground frost -1.1C. Some cloud was lingering, but Atlantic-high 1041 mb was SW of Ireland, with a ridge towards Anglesey and the cloud was thinning, high-pressure would lead to a most dramatic change in the weather pattern through to the end of the month. To the north of us there was an occluded front with showers of rain and snow, to the south there was a warm front with rain. In between, well it was not too bad a day, bright some weak sunshine in the morning and sunny by afternoon, a shade warmer than yesterday. It did turn cloudier later as the front tried to edge back north (St Catherine's Point 12.7C Porthmadog 11.6C, Liscombe & Tredegar 3.8C, Katesbridge -5.0C Sennybridge 1.2C, Mumbles Head 9.6 mm, Prestwick 9.0h Valley 2.7h) [Max 9.2C Min 2.9C Grass -1.1 Rain 0.4 mm].

There was hardly a cloud in the sky on the morning of the 20th, a little cumulus over the Snowdonia Mountains. Pressure 1033 mb was rising with high 1038 mb N of Scotland with a ridge 1036 mb W of Malin Head. Cool overnight, minimum 3.3C with a ground frost -1.7C. There was a light E'ly breeze and the temperature 5.8C, visibility was very good. Worked in the garden, planted out some Swiss chard that had stood all winter in modules; serviced the lawn mowers (Flymo and Honda) and glad I got them running smoothly afte winter storage. Hedgehog foraging on the lawn at the weather station.I found tis hedgehog foraging on the lawn, usually don't see them during the day, this one looked healthy enough. We see them from time to time and they leave their droppings in the night near a tray of water. We think they live and hibernate in several ecopiles we have in the wood. Some cloud encroached later associated with an Iberian low 1011 mb that brought some rain to the English channel earlier in the day. Soil moisture under grass determined today was 49.5% dm down from 53.7% dm on 7 February. The best of the weather was in the north-west today (Crosby 11.7C Porthmadog 11.6C, Braemar -7.5C Libanus 0.0C, Bedford 1.8 mm Sennybridge 1.0 mm, Tiree 11.5h Valley 9.8h) [Max 10.1C Min 3.3C Grass -1.7C Rain nil]. The 21st began mostly cloudy, but bright and fine. A cool morning 5.9C with an E'ly breeze. The afternoon was sunny (Otterbourne Water Works 12.7C Pembrey Sands 12.3C, Aviemore -6.7C Kielder Castle 1.4 mm East Malling 11.4h St Athan 8.0h) [Max 10.5C Min 3.0C Rain nil]

A very fine and sunny morning on the 22nd, and unusually quiet even for a Sunday #lockdown. Just 3 oktas of cirrus clouds and good visibility with a little haze. There was drumming from a woodpecker in the wood and I spotted a treecreeper, they are normally quite elusive birds. A cool night with clear sky the minimum had been down to 1.2C and there was a ground frost -2.4C that had all disappeared by 0900 GMT. It was a good day to sow some broad bean seeds in small pots in the greenhouse to bring on before planting out on the vegetable plot. Used our own compost, but could not get supplies from garden centre as confined to the property due to COVID-19 issues #StayingAtHome (Porthmadog 14.3C, Eskdalemuir -3.5C Capel Curig -2.6C, South Uist 2.8 mm East Malling 12.2h Aberporth 11.3h) [Max 11.9C Min 1.2C Grass -2.4C Rain nil], Tweet about #StayingAtHome .. Very fine and sunny again on the 23rd with pressure steady on 1025 mb in a ridge to S Britain from high 1043 mb over the E Baltic. A low 958 mb over the Denmark Strait meant tight isobars to the NW and fresh winds, Aultbea gusting 52 mph at 09 GMT, and cloudy. Here we had much lighter breezes and sunshine, best in the west (Trawsgoed 15.7C, Topcliffe -6.0C Hawarden -3.0C, Harris Quidnish 20.0 mm Wales nil, East Malling 12.3h St Athan 11.2h) [Max 13.8C Min 2.0C Grass -1.9C Rain nil]. It was great to hear a chiffchaff when I went out to take the obs on the 24th at 0900 GMT. The first of the season, for us a true harbinger of spring. One day earlier than the median date of arrival in recent years. Very fine with a moderate SSW'ly breeze. The temperature rose to 14.6C in the afternoon, but reached 19.4C in Bodelwyddan (Rhyl). Worked in the garden, started digging the vegetable plot. We still have purple sprouting, kale and a plentiful supply of leeks. Best in the west, Wales had no significant rainfall, wet in Harris, western Isles (Rhyl (Bodelwyddan) 19.4C Santon Downham -4.0C Harris Quidnish 41.0 mm Wales nsr East Malling 12.3h St Athan 10.8h) [Max 14.6C Min 4.2C rain nil]. Tweet about comma butterfly and glory-of-the-snow in the garden ..Hardly a cloud in the sky again on the the 25th and after a minimum of 6.7C was already 11.9C at 0900 GMT. Pressure was steady on 1023 mb with the high 1041 mb E Europe. There was a cold front NW Scotland associated with low 1014 mb FitzRoy. S Britain was sunny while it was cloudy in the NW with rain in Ireland and Scotland. It was perfectly dry here with the temperature rising to 18.1C at 1309 GMT. Bala reached 18.2C, Bodelwyddan 17.7C, Mona 15.7C, Gorwel Heights 15.1C and Valley 14.1C. It was very stormy off the Norwegian coast and I'm sure the Hurtigruten ferries would be glad they use the inner passage, they have been sailing these waters since 1893 (Bala 18.2C Santon Downham -4.3C Achnagart 16.0 mm Wales nsr, East Malling 12.3h Aberporth 11.8h) [Max 18.1C Min 6.7C Rain nil]

I did spot a little cloud at 0900 GMT on he 26th, 1 okta recorded. Otherwise blue sky with moderate hazy visibility (pollution smoke code 04). Very fine and sunny with a temperature of 9.8C rising to 14.3C just after noon. It would have been a good day to go out on an ecological site visit, but with #lockdown in force I made do with 5 times circuits the garden and wood that is 1 mile. Tweet about low humidities .. The Black Hamburg grapevine in the greenhouse has sprouted (Levens Hall 18.0C Porthmadog 17.9C, South Newington -5.3C Usk -2.8C, Derrylin Cornahoule 3.4 mm Wales nsr, Aberporth 12.1h) [Max 14.3C Min 5.6C Rain nil]. The 27th was very fine and sunny with a cool ENE'ly breeze. Pressure 1027 mb was rising with Atlantic-high 1034 mb lying to the north-west. No cloud in the sky at 0900 GMT, very good visibility with smoke haze, ozone levels were moderate across S Anglesey and Snowdonia (source: Air Quality Wales) . The relative humidity was unusually low 37% here, with a temperature of 8.7C dewpoint -5.2C, falling to 32% (dewpoint -5.5) at 10.1C at 1000 GMT. Buff-tailed bumblebee on comfrey.At Gorwel Heights RH was 18% (dewpoint -11.9C) at 10.8C; Gorddinog RH 20% (dewpoint -10.4C at 11.9C; and at Valley (METAR) 46% this falling to 32% (dewpoint -5C) ambient 11C at 0950 GMT. The event lasted several hours spreading to other areas in central Britain, but not as low values. Values rose slowly, but at 1250 GMT was 34%, at 1500 GMT 60% . In the afternoon a mass of buff-tailed bumblebees were feeding on a patch of common comfrey at the edge of the wood (right). The head gardener spotted a red-tailed bumblebee amongst them, but I was not quick enough to capture a photograph (Porthmadog 16.2C Bala -4.8C Edinburgh Botanic Gardens 2.6 mm Aberporth 12.2h Valley 11.5h) [Max 11.9C Min 2.5C Rain nil].

On the 28th intense Atlantic-high was S of Iceland and low 993 mb N Norway had an associated cold front over Scotland. Remnant frontal cloud was charted over N Wales at 06 GMT; we had 6 oktas of cloud cover at 0900 GMT, high cirrus with lower altocumulus lenticularis to the south, clearing later. It was fine, fairly bright and 7.6C, but the force 4/5 NE'ly breeze felt cold. There was sunshine further SW and S England, in Scotland it was snowing at Altnaharra and was lying at 3600 ft on Cairngorm Mountain (Hurn 13.8C Bala -3.1C Resallach 2.4 mm Camborne 11.5h Valley 7.1h) [Max 11.0C Min 3.2C Rain nil]. It was a cold morning on the 29th, the 4.3C bitter in the force 5/6 NE'ly wind. All surfaces were dry, and the ground was hard and showing surface cracking, not by frost (grass minimum 0.7C, but by dryness. There had been no rain for 11 days; and there was none today. Pressure remained high 1046 mb rising with intense high 1055 mb at noon S of Iceland dominating the weather. Sunny at times, but cool the maximum 8.2C fifth lowest of the month (Usk 10.1C Castlederg -2.5C Resallach 4.2 mm Camborne 11.2h St Athan 10.5h Valley 4.6h() [Max 8.2C Min 3.0C Rain nil].

A greater spotted woodpecker had found a very resonant tree branch on which to drum on the 30th as I reached the Stevenson screen for the obs at 0900 GMT. It was dull with a light to moderate N'ly wind and the 6.9C temperature felt chilly. Still no rain to measure, I shook out dust, bud scales and a spider from the rain gauge bottle, no beetles today. Any Saharan dust is currently being transported N around the Atlantic intense-high 1051 mb W of Scotland, the jetstream is also in this position. Any dust we have at the moment is mostly local in origin. It continued breezy in the morning and some sunny sells developed in the afternoon. Farmers have been putting several loads of dung on the field adjacent to the weather station, I suspect it is in preparation for it's rotational ploughing and planting a cereal crop. For the last years cattle and sheep have been grazing this field (Glasgow 13.5C Porthmadog 12.8C, Lo Max Lake Vyrnwy 6.2C, Min Trawsgoed -4.0C, Resallach 7.4 mm, Boulmer 10.7h Aberdaron 7.4h Valley 5.0h) [Max 10.5C Min 3.1C Rain nil].

View of the Carneddau Mountains, Wales in #lockdown.

A very fine and sunny day on the 31st with a few cumulus clouds at first and very good, clear visibility. The 6.8C RH 80% felt chilly in the E'ly breeze. Pressure was 1037 mb with Atlantic=high 1046 mb not quite as intense, remnant cold front central England, showers on the East Coast, The Wash and Maplin Head. But nice in the garden #StayingAtHome did 3 laps of the garden and got on with some pruning jobs. Still #working some contractors for Scottish Power came to coppice trees under a power line going to neighbouring property. They come every so many years to do this, surprised to see them, did not approach kept well clear, did not stay long. Kept dry during the day (Porthmadog 13.0C Katesbridge -2.9C Resallach 4.6 mm Shoeburyness 11.7h Valley 10.4h) {Max 10.9C Min 3.5C Rain 0.4 mm].

In contrast to February the month ended with a rainfall total of 85.7 mm, close to the averages (104%) & [101%], the PWD (Potential Water Deficit) was 34.5 mm. Temperatures were also close to the averages with the mean on 7.0C (+0.2) & [0.0] ranking 19th lowest in station records since 1979. Sunny.

 

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April 2018

#StayingAtHome #lockdown

April 1 - began on a dull note with overcast skies, moderate hazy visibility after recent slight rain. April is usually a dry and sunny month in these parts, after the dry end to March we could do with rain. Pressure 1027 mb was falling with Atlantic-high 1039 mb W of Ireland, and a ridge towards western shores, losing intensity. Seagulls following the plough. There was a fresh feeling NNE'ly breeze veering SW'ly by the afternoon. A little brightness at times with the odd glimpse of sunshine in the morning. There was a cold front N of Scotland associated with low 992 mb over the Norwegian Sea. Ploughing of the field adjacent to the weather station was attracting a lot of seagulls (tweet) picking up what they could find in the turned over soil, the field had been heavily dunged in recent days. A cool day (Gosport 13.3C South Farnborough -5.2C Resallach 9.8 mm Camborne 7.3h Aberporth 0.8h Valley 0.1h) [Max 9.8C Min 4.1C Grass 1.2C Rain 0.6 mm]. A similar start on the 2nd, overcast skies after recent rain, dull and damp. Pressure 1017 mb was still falling as Atlantic-high 1031 mb to the SW with ridge to Cornwall continued to decline. Low 970 mb over the Norwegian Sea had an associated cold front over the North Channel. It was windy in the N of Scotland with Wick reporting gusts of 51 mph. Some brightness with glimpses of sunshine in the afternoon, a little warmer and a dry day (Gosport 15.1C Cardiff 14.0C Santon Downham -1.8C Resallach 13.2 mm Swyddffynnon 5.4 mm Leuchars 8.0h St Athan 3.7h) [Max 12.2C Min 6.2C Rain nil]. A better day on the 3rd starting mostly cloudy, but with signs of the sky clearing in a light WSW'ly breeze. Visibility was good, but hazy and some bright spell with glimpses of sunshine came along during the morning. Pressure was steady on 1018 mb with a high 1022 mb over Biscay and a warm front across the Severn estuary. Still a little cloud around in the afternoon, but this disappeared to give a largely sunny evening. The adjacent field was cultivated today using a 'modern' cultivator it did not seem to take long to get the job done (Cardiff 14.9C Tulloch Bridge -4.3C Resallach 10.4 mm St Athan 8.9h Valley 5.2h) [Max 11.6C Min 3.3C Grass 0.6C Rain nil]. Similar on the 4th fair early in the day, mostly cloudy at 0900 GMT with a temperature of 9.4C. Pressure unchanged steady on 1017 mb with high-pressure 1025/ 1020 Europe and Spain. Atlantic-low 983 mb S of Iceland, it was cloudy in the SW and W and sunny in the E and SE. It was raining in NW Scotland. Here not a bad day, very good visibility so a few small surviving snow patches on Y Garn, Carnedd Llewelyn and Snowdon (Garnedd Ugain). Soil temperatures are still below 10C down to 1 m, at 30 cm it was 9.3C so should be fine for seed germination if a little on the dry side. A warmer day. BBC News: People across the UK appear to be adhering to social distancing rules despite the temptation to go out in the sunny weather, Cabinet Office Minister Michael Gove has said. Police face "one of their biggest challenges" of the coronavirus lockdown as the weather improves. He said there was "evidence to suggest" there has been a lower level of compliance among young people. Sussex Police said that two people had been summonsed to attend court after having a barbecue on Hove beach. Others had been stopped by Police entering Wales going to holiday homes or to climb mountains (St James Park 17.3C Lerwick 7.2C, Baltasound -3.5C Baltasound 11.0 mm Wattisham 12.3h (Valley 4.5h) [Max 14.9C Min 6.4C rain nil]. Tweet about the Foehn wind .. The sky had been clear overnight and early on the morning of the 5th, but since had become mostly cloudy 7 oktas at 0900 GMT. Tweet about te first bluebell of the season ..It was, however warm, 14.9C with RH 52%, it was that SE'ly somewhat gusty Föhn wind off the mountains again. The first bluebells of the season had sprung up in the wood, two weeks later than last year, but on the median date of appearance in recent years. The ground was hard and dry with cracks in the soil surface of the met plot. Pressure 1007 mb was falling with low 972 mb W of Shannon on an approaching course. It was raining in SW Ireland, but it was sunny most places and here a nice sunny afternoon. The temperature reached 21.8C at 1359 GMT the RH dropping to 37%. Gorwel Heights AWS had 21.9C and Gorddinog AWS 22.4C. Had to dash inside at 3 pm to join in a family Zoom meeting. There was a little showery rain before midnight (Porthmadog 22.2C Inverbervie 8.4C, Santon Downham -1.4C Cardinham 4.8 mm Scolton 3.2 mm Shoeburyness 12.6h Aberporth 8.5h Valley 5.5h) [Max 21.8C Min 7.4C Rain 1.2 mm]

The small amount of rain 1.2 mm overnight had dampened the ground 'laying the dust' so that all monitored surfaces soil, concrete and grass on the morning of the 6th were damp. Not enough by any means to restore the water balance. A fine bright morning with sunshine as any lingering cloud (3 oktas) reduced. Pressure 1013 mb was rising with a low 955 mb SW Iceland and an occluded front over the Irish Sea at 06 GMT. The band of showery rain was now over SE England, otherwise sunny. Potted up seedling tomato plants for the greenhouse and for outdoors eventually when the minimum temperatures are higher (Frittenden 18.8C Dalwhinnie 8.5C, Okehampton 5.3C Tyndrum 16.0 mm Tredegar 9.6 mm Aberdaron 12.3h Valley 11.5h) [Max 13.6C Min 8.3C Rain nil]. A very fine and sunny morning on the 7th, I was pleased to hear a blackcap singing the first this season joining the chiffchaff that arrived on the 24 March. No sighting here of house martin or swallow. Visibility was very good with slight haze, a snow patch was still visible on Yr Wyddfa. With pressure on 1029 mb and high 1031 mb not far away over the S North Sea, the jetstream was set well to the N of the UK, a fine day was expected. The temperature was 11.2C and though it did not rise to yesterday's heights the 16.3C in the afternoon was not too bad in a sheltered spot in the garden (Northolt 20.4C Cardiff 17.7C Aberdaron 12.9C, Sennybridge -3.1C Baltasound 2.6 mm Aberdaron 12.5h Valley 12.1h) [Max 16.3C 4.3C Grass 1.2C rain nil]. After an almost clear overnight sky and a very bright moon, apart from early weak glimpses of the sun on the morning of the 8th moderately high altostratus cloud had encroached. It was fine and the temperature 14.1C and pressure steady on 1026 mb. Visibility was very good and clear of haze. Pressure was low 1023 mb over Biscay and 984 Norwegian Sea. There was a cold front over the N of Scotland and a detached warm front over the English Channel. Not to worry, it was sunny by afternoon and several first sightings of holly blue, orange tip, large white, and small tortoiseshell butterflies. Peacocks seen earlier were also seen, but not comma. The wild cherry was starting to bloom on the top of the tree, no leaves yet. The garden has got very dry and some irrigation of flower beds was necessary (Herstmonceux 23.9C Aberporth 15.5C, Kielder Castle -0.5C Mona 1.8C, Lentran 8.4 mm Morpeth 12.0h Aberdaron 9.7h Valley 7.7h) [Max 18.9C Min 7.0C Rain nil]

Much the same on the 9th albeit broken cloud at 0900 GMT. Pressure steady on 1025 mb with high 1029 mb stationed over the N of Scotland, frontal cloud was over the Borders. Very fine, feeling pleasantly warm, butterflies around the garden. Air pollution ozone moderate level 4 in places including N Wales. Soil moisture level under grass determined today 44% dm was drier than in April and August 2019. On the uncultivated bare met plot it was 14% dm just lower than the permanent wilting percentage 15% for the local soil. All the temperatures in the soil profile 5 - 100 cm read 10C, or more this morning, for the first time this year; 5 cm 12.9C; 10 cm 10.7C; 20 cm 10.4C; 30 cm 11.0C; 50 cm 10.5C; and 100 cm 10.0C. A pleasant evening with little wind and a bottle of beer (Wiggonholt 24.4C Usk 24.1C, Kinbrace -6.7C Glasgow 2.6 mm Bournemouth 12.1h St Athan 11.8h Valley 10.2h) [Max 20.9C Min 8.3C Rain nil]. The 10th began fine and warm after a mild night air minimum 11.5C, warmest since 16 January (11.6C). The temperature at 09 GMT was 18.5C with RH 61%. Broken cloud some cumulus with high cirrus clouds. Visibility was moderate with thick haze the result of air pollution and Saharan dust. Ozone levels were moderate level 5 in N Wales (Machlyn Mawr), Cardiff City centre, Cwmbran and Port Talbot (source: Air Quality Wales). I had noticed that seedling sensitive tomato varieties had leaf marks typical of ozone damage. Very fine and sunny day, it was our turn for a warm 22.4C in the Föhn-enhanced breeze, highest maximum of the year so far (Gorwel Heights 20.2C & Gorddinog 20.6C). Pressure was on 1023 mb in a ridge from high 1034 mb SE North Sea in command. Some cloud encroached by evening (Bude 25.0C Trawsgoed 24.8C, Loch Glascarnoch 1.9C Thomastown 7.6 mm Bala 3.6 mm Shoeburyness 12.6h St Athan 12.2h Valley 9.5h) [Max 22.4C Min 11.5C Rain nil]. A fine and warm morning with scattered clouds in hazy sunshine on the 11th, after an overnight minimum of 11.5C, highest of the month so far, the temperature 15.3C at 0900 GMT. Pressure 1024 mb was rising in a ridge from Azores high 1032 mb to central UK. Visibility was poor (< 2 km) in thick haze (smog) a combination of Saharan dust and air pollution. The ozone level at Marchlyn Mawr was a level 5, but was low for NOx level 1. Cardiff City centre ozone was on level 2 and Port Talbot level 3 (source: Air Quality Wales). Despite there being less traffic on the A55 (cameras) the road here seemed just as busy #lockdown. The wild cherry tree had blossom from top to bottom branches today, it is loved by the birds especially chiffchaff and blackcap. Did not quite make 20C today (St James Park 25.5C Cardiff 25.0C, Santon Downham 2.1C Baltasound 6.4 mm Aberporth 12.3h Valley 10.6h) [Max 19.8C Min 11.5C Rain nil]. A fine, but cooler (11.8C) and dull morning on the 12th with moderately high altostratus and cumulus clouds. Visibility had improved and was good to very good with the mountaintops in the clear. The ozone level at Marchlyn Mawr was level 3 and Cardiff City centre and Narberth 2 (source: Air Quality Wales). Pressure was high 1035 mb between Scotland and Iceland, but pressure here 1014 mb was falling with low 1006 mb over Biscay pushing frontal systems our way with a cold front reaching here at 1530 GMT. This weak system produced next to no rain here, but some mixed source dust fallout, and a slow fall in temperature. Llanfairfechan AWS Gorwel had 0.8 mm and Gorddinog 1.0 mm c. 1830 GMT. Hawarden reported 10.2 mm and dust fallout was reported in Wilmslow in heavy rain (St James Park 25.0C Usk 21.6C, Dalwhinnie 1.0C Hawarden 10.2 mm Reading University 11.4h) [Max 15.2C Min 9.0C Rain 0.1 mm].

After yesterday's minor disturbance the weather on the 13th was back to being fine and sunny. Hardly a cloud in the sky, but a moderate ENE'ly breeze that made the 7.4C at 0900 GMT feel rather fresh. Pressure 1029 mb was rising again with high 1035 mb unusually placed between Scotland and Iceland. A dry sunny day (Cardinham 14.4C Pembrey Sands 14.3C, Dalwhinnie -0.7C Pennerley 19.4 mm Hawarden 3.2 mm Rostherne 12.9h Valley 12.7h) [Max 11.1C Min 5.2C Rain nil]. With high pressure 1030 mb (UK) dominating our weather it was another fine sunny morning on the 14th with just a little cumulus cloud appearing at 0900 GMT. Overnight there had been a ground frost -1.8C, the air temperature went down to 1.5C but, Valley reported an airfrost -1C. The NNE'ly breeze was light, but the 9.3C still felt a little cool. It was a cold day in the NE, at Newcastle after an airfrost -4C the temperature struggled to reach 6C in the breeze off the North Sea and made the 12.5C reached here positively balmy. Manchester reached 10C after an airfrost of -2C. Our Bardsey apple tree has started to flower, earlier than last year when it did not flower until 7 May. Planted out 3 rows of broad beans raised from seed in the greenhouse, they are more successful here grown like this, in the past I have had the seed taken by mice and the small seedlings eaten by slugs. The larger plants stand a much better chance. There was an aircraft flying around today, there have been none for a while. An aerial survey has been carried out in the area of the Carneddau and Llyn in recent days, the flight path did pass over here. The coastguard helicopter, usually busy, has also not been seen #lockdown (Helens Bay 16.8C Bala 15.3C, Redesdale Camp -6.7C Capel Curig -3.1C, Baltasound 3.2 mm Aberporth 13.1h) [Max 12.5C Min 1.5C Grass -1.8C Rain nil]. Very fine and sunny again on the 15th with very good visibility and slight haze. Pressure was steady on 1024 mb. A jet aircraft flew by at 0944 GMT. The NE'ly breeze strengthened through the day (Durham 21.2C Usk 18.6C, Katesbridge -4.2C Cassley 1.4 mm Eskdalemuir 13.3h Aberdaron 13.1h) [Max 15.6C Min 3.7C Grass 0.2C Rain nil].

The first 15-days of the month had been very sunny and dry with rainfall of just 1.9 mm (4%) & [3%] of averages. Temperatures were on the warm side with the mean 11.1C (+1.9) & [+2.2]. No air frosts, there had been 1 ground frost.

Another glorious day #StayingAtHome in the garden on the 16th, plenty of jobs to do (running behind with weather updates) and the bluebells in the wood are about at their best. The ramsons, wild garlic, is flowering now and we are continuing to use it as salad, adding the odd flowering stem beloved by chefs, and a few very nutritious dandelion leaves. I have not tried the flowers yet... Traffic past the weather station seemed less this morning and birdsong sounded brilliant. Visibility was good, it was moderately hazy with Marchlyn Mawr monitoring station reporting level 3 ozone pollution, the forecast however was for level 4 to 5 (source: Air Quality Wales). A small amount of cirrus clouds and an ENE'ly breeze, a pleasant 19.1C in the afternoon, and no rain (Bude 21.8C Porthmadog 21.7C Gorddinog 21.1C, Santon Downham -2.1C Bala -1.1C, Resallach 1.0 mm, Morecambe 13.1h Aberdaron 12.0h) [Max 19.1C Min 6.6C Rain nil]. On the 17th the bud scales have started falling off the opening buds on the trees. They are sticky, are a problem to clear up and stick to your shoes and get in the house. Otherwise one welcomes the new light green foliage of spring as will the birds when the insects emerge. It was another fine morning with a few cumulus clouds and just good visibility in thick level 4 smoke haze. A fly in the ointment is a slow-moving low 1005 mb just off cap Finisterre pushing weather up to Brittany and beyond. There were sferics seen in the Channel off Caen, France. Rain was seen on the radar at Porthmadog and Llyn at 10 GMT. Mostly sunny at first, cloud developing rather quickly and a maximum of 14.0C reached at 1328 GMT. Cloud thickening in the afternoon and a heavy localised shower of rain at 23 GMT in the evening, not seen in Llanfairfechan (Porthmadog 18.1C, Tredegar 9.4C, Aboyne -5.4C Lake Vyrnwy 5.7C, Thorney Island 20.6 mm St Athan 10.0 mm' Stornoway 13.6h Valley 3.9h) [Max 14.0C Min 6.0C Rain 7.2 mm]. A fine morning on the 18th with a little weak sunshine. After the shower of rain in the night surfaces were damp and plants in the garden had perked up. The 7.2 mm was sufficient to ensure that this April would not be the driest in Llansadwrn on record, the 9.0 mm so far now exceeding the 6.7 mm recorded at this station in 1980. Pressure 1018 mb was rising with slow-moving low 1011 mb over the Celtic Sea. There was band of cloud over the N Irish Sea and Liverpool Bay, with another over St George's Channel. Little in the way of sunshine today, with a maximum daytime temperature of 11.9C at 1316 GMT, and the afternoon increasingly dull with some spits and spots of rain sufficient to give up gardening activities for the day (Aviemore 16.5C Pembrey Sands 13.8C, Lake Vyrnwy 5.2C, Aviemore -5.4C Lake Vrnwy 3.0C, Lyneham 25.6 mm Usk 9.2 mm, Stornoway 13.7h Valley 0.9h) [Max 12.7C Min 6.4C Rain 0.3 mm].

Part of the old bluebell wood at the weather station in #lockdown.

 

The 19th was a beautiful bright and warm morning. Being a Sunday it was quiet, and no church services and bells because of #lockdown. I walked around the wood with bluebells and wild garlic at their best, no traffic, no sounds other than the vibrant singing of so many birds, blackbird, robin, thrush, persistent great tit, agitated wrens and a sudden resonant drumming of a woodpecker, a startled pheasant and the whisper of a gentle SE'ly breeze in the treetops. I must not forget the aroma of wild garlic underfoot in places - it was a remarkable treat. Horse chestnut bright green leaves and striking white flowers.The temperature had reached 12.7C at 0900 GMT, the maximum of the past 24-h, with 75% RH, very good visibility haze slight, pressure steady on 1022 mb with S Norwegian high dominating. Close encounter with a pile of plates.Cloudy on the western fringe, early upslope stratus cloud was clearing from the Snowdonia mountaintops, elsewhere sunny. In the afternoon I was treated to a close encounter with a 'pile of plates' hovering for 20 minutes or so over the old Gadlys cricket field. Horsechestnut flowers looked striking in today's sunshine and ants were back under the cover, an old metal dustbin lid, of the lysimeter tank (Porthmadog 18.3C Gorddinog 18.0C Lake Vyrnwy 12.4C and 4.8C, Tredegar 0.4 mm Lake Vyrnwy 10.7h Valley 6.5h) [Max 15.3C Min 6.3 Rain nil].

The 20th began without a cloud in the sky with good visibility and moderate haze the result of pollution ;smoke' and Saharan dust. With a moderate NE'ly breeze all surfaces were dry, the 8.9C at 0900 GMT felt 'fresh'. Trees hereabouts are greening up noticeably quickly, beech a nice pale green colour in particular, Cattle are now grazing the fields near the weather station, the sheep have been moved off somewhere else. Best in the west Cardiff 19.1C, Braemar -5.7C Bala 1.3C, Baltasound 0.4 mm Kinloss 14.2h Aberporth 13.5h Valley 13.0h() {Max 16.0C Min 4.8C Rain nil]. Well there was just a little cloud today the 21st, a lenticular altocumulus cloud had formed just to the S, it did not persist very long It was feeling very fresh in the strong ENE'ly breeze with a temperature of 9.9C, this rose to 18.0C in the afternoon and if you found a sheltered spot it was quite warm. Orange coloured Welsh poppies are in flower in the garden and the blue irises are budding up, these usually give a spectacular display later on. An elm tree, a survivor of the Dutch Elm Disease that affected the wood greatly in the 1970s, was in flower. Soil moisture under grass (2-8 cm) determined today was 39.1% dry mass down from 43.8% dm on the 8th. The top 2 cm consisting of mainly compacted roots and grass containing most of the moisture was 46% dm, down from 69% dm on the 8th. On the undisturbed met plot 0-8 cm deep was 15.2%, similar to that at the beginning o the month. On the vegetable plot, that has a larger organic matter content (part not irrigated), 0-8 cm was 20.7% dm and 8-14 cm was 24.5% dm. The permanent wilting percentage for the soil here is 15% dm. We do have a very dry event and need rain. It is remarkable that this situation has arisen so quickly after the wet months of February and March, this is not only due to having had just 8.8 mm, but also the above average temperatures and high evaporation rates. Today's ET (AWS calculated evapotranspiration) was 3.5 mm, the total this month to date 55.2 mm. You can read about a previous dry spell in March and April 2003, and concerns about soil water here and about the 18-day drought in May 2004 here (Porthmadog 20.9C Fair Isle 10.7C, Braemar -5.9C Sennybridge 2.9C, Scilly 2.6 mm, Kinloss 14.2h Hawarden 13.4h Valley 11.4h) [Max 18.0C Min 6.2C rain nil]..

Pink

 

It was sunny everywhere on the morning of the 22nd with just 1 okta noted here at 0900 GMT. All surfaces were dry, except the lysimeter where there was heavy guttation. Pressure was steady on 1022 mb with high 1037 mb S Norway unmoved. Low 1006 mb was over the Med with disturbed weather, a detached occlusion was off SW Ireland and over Charente Maritime. Fine and sunny here, but there was a slowly moderating force 5 NNE'ly so finding a sheltered spot was best, it was warm in the afternoon with a maximum of 18.2C (Hurn 22.6C Porthmadog 22.3C, Braemar -4.8C Bala 1.5C. St James Park 0.2 mm, Kirkwall 13.8h St Athan 11.9h Valley 11.4h) [Max 18.2C Min 6.2C Rain nil]. A mostly cloudy start to the day on the 23rd with weak sunshine cloud decreasing with sunshine later. A little warmer, 12.6C at 0900 GMT rising to 18.9C in the afternoon. Pressure steady on 1022 mb with high 1030 over the Norwegian Sea, Erected temporary extra staging in the greenhouse to accommodate pricked out seedlings growing for the herbaceous border and indoor / outdoor tomato plants (Herstmonceux 24.3C Porthmadog 23.1C, Fair Isle 8.5C Aberporth 15.5C, Altnaharra -4.1C Bala 1.6C, Houghton Hall 0.2 mm, Kinloss 14.2h St Athan 12.4h Valley 7.1h) [Max 18.9C Min 8.0C Rain nil]. Tricky to photograph guttation droplets at the tips of grass leaves.Another of those rare cloudless mornings on the 24th, although we have had a few lately, they are nevertheless rare here. Again all surfaces were dry except grass on the lysimeter where there was heavy guttation (photo left), this is not dew but exudation of drops of xylem sap on the tips or edges of leaves of grasses and some other vascular plants. Kept irrigated, at as near moisture saturation point as possible, the lysimeter grass is not short of water and guttation takes place, whereas there was none on the 'dry' grass areas where the soil is far below saturation at present. I have been making my own Bara Gorsaf Tywydd weather station bread for a while and made a loaf today. My home made weather station bread.I have not been able to get the Melin Llynnon stoneground wholemeal flour for some years now, so the recipe has changed. Any flour has become unobtainable in the shops at present and yeast is like gold dust #lockdown. I normally keep a small stock, but it won't last for ever. A very fine and sunny day (Porthmadog 23.2C, Wick 8.7C Libanus 17.4C, Kinbrace -5.0C Bala 0.5C, Aberporth 0.4 mm, Altnaharra 14.1h Hawarden 13.1h Valley 12.1h) [Max 19.4C Min 9.4C Rain nil]. A pleasantly warm morning on the 25th, but mostly cloudy the sky having moderately high altostratus. At 0900 GMT 17.9C and 56% RH, it was fairly bright with glimpses of weak sunshine. So pleasant that able to have a cup of coffee in the garden after obs. It was so quiet (Saturday less traffic) that I was able to hear the hum of insects in the trees along with the chiffchaff and a distant woodpecker drumming Sunshine was at a premium today with localised cloud affecting Anglesey and Snowdonia (Aviemore 20.7C Trawsgoed 20.2C, Inverbervie 8.0C Valley 14.8C, Altnaharra -2.3C Capel Curig 4.3C, Trawsgoed 0.4 mm, Dundrennan 13.6h Aberporth 11.5h Valley 2.2h) [Max 19.1C Min 9.4C Rain nil]

The 26th began very murky with very poor visibility, fog was reported at Valley. At 0900 GMT visibility was still poor partly due to poor air quality. Marchlyn Mawr monitoring station was reporting level 5 ozone concentrations compared wit the centre of Cardiff level 2. There were glimpses of weak sunshine and ground conditions remained 'dry as a bone', there was slight guttation on grassy areas this morning. Pressure 1012 mb with high 1014 mb off east Anglia. A light SW'ly freshening as a weak cold front was here about 15 GMT, the SW'ly wind backing NNE'ly. Did potting up of tomato plants currently Tumbler F1 for outdoor, Fandango and Mountain Magic, I normally grow my own, which is just as well as unlikely to get any from garden centres closed for #lockdown. Brittany Ferries appear to be operating normally for freight traffic viewed online via 'shipais'. The Company started out bringing cauliflowers from Brittany to Britain and expanded into car and passenger traffic. We have been with them many times over the years to holiday in France (Holbeach 22.4C Cardiff 19.5C, Santon Downham -1.7C Whitechurch 2.9C, Normanby Hall 8.2 mm Gogerddan 1.2 mm, Wattisham 13.5h St Athan 9.9h Valley 2.3h) [Max 13.4C Min 8.1C Rain 0.2 mm]. Emerging tree leaves looked stunning.A brighter fresher morning on the 27th with the sky clearing after a weak cold front leaving some cumulus clouds over the mountaintops of Snowdonia. Pressure was 1010 mb with low 1003 mb S Norway and an occlusion over Scotland. With a really blue, blue sky overhead the day was very sunny. In the bright sunlight the newly emerging light-green leaves on beech trees in particular across green fields, and the white flower candles on horse chestnuts, looked stunning. Cattle had replaced the sheep that had been grazing. A tempting view of the mountains and Moel Eilio currently closed to visitors (Frittenden 20.6C Porthmadog 16.2C, Katesbridge -3.4C Tredgear 5.7C, Glasgow 7.0 mm Trawsgoed 1.2 mm, Morecambe 13.9h Valley 11.2h) [Max 12.8C Min 7.3C Rain 0.1 mm]. In contrast we had a dull day on the 28th, but no one should complain as we needed some rain on the garden and fields for forage and crops to grow. Spits and spots in the morning as an area of rain to the S and SE of the Snowdonia Mountain range to arrive. Pressure was on 1006 mb with a low 1002 mb over Somerset and a with a warm front over central Wales, a detached cold front was across N England. The best of he weather was in N Ireland, N Scotland and NE England; it was very wet in S Wales. The temperature here rose to 8.6C at 1050 GMT then fell slowly, as light rain fell through most of the afternoon, to 8.0C by 18 GMT (Armagh 15.0C Milford Haven 10.4C, Lake Vyrnwy 5.9C, Braemar -6.0C Mona 2.1C, Middle Wallop 23.6 mm Tredegar 19.8 mm, Stornoway 13.4h Valley 0.0h) [Max 10.6C Min 5.6C Rain 4.8 mm].

View of the Carneddau Mountains, Wales in #lockdown.

The 29th began bright and sunny, but by 0900 GMT the sky had clouded over, the mountaintops were obscured although visibility under the cloud was very good. Pressure 998 mb was falling quickly with low 987 mb W of Ireland tracking towards the Isle of Man. An occlusion was over the Celtic Sea while low 1003 mb was over the southern N Sea with an associated warm front over Anglesey. There was slight rain at first then some sunshine before a spell of rain before noon. The sky cleared in the afternoon, I took a #lockdown photograph from my usual snow observation station, there was none. Later, cloud encroached as the wind strengthened and there was some more rain around 21 GMT ceasing before midnight. Rainfall of 7.8 mm was the largest of the month () [Max 12.4C Min 5.6C Rain 7.8 mm]. It had been cold enough overnight for snow to fall on the mountaintops of Snowdonia, but at 0900 GMT on the 30th with 8 oktas cloud cover the summits were hidden from view. Pressure was 998 mb with the low 986 mb centred near the Isle of Man. The jetstream is now re-established to the S of the UK over France and N Spain and we have more unsettled cooler northern weather to end the month. The airflow today was from polar regions of the NW Norwegian Sea past Iceland. The temperature was 6.8C the lowest since the 1st of the month, rising to only 8.5C at 1540 GMT making this the coldest day of the month, but the maximum of 9.3C was just before 0900 GMT tomorrow the 1st of May which by convention is credited to the 30th April. There was slight showery rain and the garden was looking all the better for it the plants looking much fresher. Showers continued to affect the W and N while to the E there were sunny intervals before showers developed there too. In the evening a heavy shower of 5 mm hail was reported in Wilmslow (Kinlochewe 16.0C Cardiff 13.3C, Shap 0.9C Sennybridge 3.8C, Capel Curig 33.8 mm, Manston 8.9h St Athan 4.7h Valley 0.1h) Max 9.3C Min 5.3C Rain 2.8 mm].

A sunny and warm month. Temperatures above averages, the mean highest since 2011 was 11.1C (+1.9) & [+2.2] ranked 3rd in station records since 1979. The rainfall total of 25.1 mm, close to the averages (47%) & [40%], least since 2010 ranked 9th in Llansadwrn records back to 1928.

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May 2018

#StayingAtHome #lockdown

May 1 - fine and sunny, but the 9.1C at 0900 GMT was feeling fresh in the air flow from the Greenland Sea. Pressure 998 mb was rising with a complex low-pressure system 989 mb off Wick 991 mb North Sea having an occlusion over Cumbria and W Scotland at 06 GMT, the North Sea low was 993 mb at 0900 GMT moving towards the Baltic. Ozone concentrations were down this morning level 2 at Marchlyn Mawr the same as Cardiff City centre and Port Talbot (source: Air Quality Wales).

View of the Carneddau Mountains, Wales in #lockdown revealing a little snow.

Mostly sunny in the afternoon the cloud lifting to reveal a little snow left on the tops of the Carneddau and Snowdon, there were a few widely spaced showers around, we caught one of rain at 1930 GMT (Edinburgh Botanic Gardens 16.1C Usk 15.1C, Katesbridge -2.1C Lake Vyrnwy 4.0C, Myerscough 12.0 mm Llysdinam 6.2 mm, St Athan 11.4h Valley 8.3h) [Max 13.7C Min 5.7C Rain 0.3 mm]. Frequent snow patches left after recent snowfall.Fine and sunny on the 2nd with pressure 1011 mb rising. Low 1001 mb was on the move off Aberdeen over the North Sea heading for S Sweden. We still had a cleaner fresh Polar air flow, there were showers affecting the western fringe, but they kept away from here. Sunny and feeling warmer in the afternoon Kew Gardens 18.0C Usk 16.7C, Katesbridge -0.4C Usk 1.5C, Scarborough 4.8 mm Cardiff 3.2 mm, Prestwick 13.9h Valley 10.9h() [Max 14.3C Min 3.9C Rain nil]. On the 3rd there were bands of decaying frontal cloud across Wales to Kent. A little sunshine early in the day before becoming mostly cloudy by 0900 GMT, visibility was excellent. Possible moss carder bee on comfrey in our Garden at Gadlys.There was a more active system 1008 mb off SW Ireland with a front over the Severn estuary, Scotland and NE England also had some cloud. Pressure here 1016 mb was rising and the day became brighter, sunnier and warmer by afternoon. There were several bumble bees on the flowers and particularly attractive was a bed of comfrey. Several possible moss carder bees Bombus muscorum with ginger-coloured thorax were feeding. There was one red-tailed bumble bee, but I did not manage to get a photo. There was a fair amount of traffic in both directions past the weather station, the Britannia Bridge, however, was deserted (Carlisle 17.7C Hawarden 17.2C, Kinbrace -6.6C, Pateley Bridge 14.6 mm St Athan 2.6 mm, Morecambe 13.8h Valley 8.2h) [Max 15.6C Min 6.2C Rain nil]. A fine morning on the 4th after a mostly clear night the 3 oktas cumulus cover reducing at 0900 GMT. Pressure 1021 mb was steady with high 1027 mb S Iceland to NW Scotland. Frontal cloud associated with low 992 mb W FitzRoy was affecting southern Britain. Cloud was also affecting coastal areas NE England and there was early mist in central England. The best sunshine and highest temperatures were here (Porthmadog 20.1C, Kinbrace -3.0C Capel Curig -0.4C, Aviemore 8.2 mm Tiree 14.3h Valley 14.1h hours) [Max 16.1C Min 4.9C Rain nil]. Another almost cloudless morning on the 5th, but the was a stiff E'ly breeze stirring the trees. Visibility was very good and it was 10.7C and 68% RH. Sunny. Jets from RAF Valley were around and occasionally fly over the weather station, and I could here the buzzing of the Texan T1 advanced turboprop trainers, currently fling over the SW corner of the island, used to prepare pilots for Advanced Flying Training on the Hawk T2 jets (Porthmadog 18.6C, Kinbrace -3.9C, Culdrose 33.6 mm, Dundrennan 14.3h Aberdaron 14.3h Valley 13.5h hours) [Max 16.1C Min 6.9C Rain nil].

I tried to find a bit of cloud somewhere in the sky on the 6th, but there was none. It was sunny and dry, all surfaces that I record, very good visibility and it felt a little warmer, the 14.2C at 0900 GMT very pleasant indeed. With pressure 1015 mb would rise and we were within UK high 1028 mb centred near Newcastle.Asphodelus alba in flower in our garden at Gadlys.Sunny except for Cornwall that was under an occlusion over the Celtic Sea. The attractive white Asphodel Asphodelus alba is flowering in our garden (left). A native of southern Europe from Spain to Greece. It's hardy, we have seen at altitude in the Pyrenees as well. Worked on the veg plot to get it ready for planting out lettuces raised in modules. Enjoyed a cool beer afterwards () [Max 18.8C Min 5.2C Rain nil]. On the 7th pressure 1021 mb was falling as low 998 mb over the Atlantic SW of Ireland had frontal cloud affecting the western fringe, 7 oktas cover recorded, visibility very good. There was a shower trough over the Severn and Pembrokeshire. A temporary S'ly air flow meant we had warmer conditions with 16.4C at 0900 GMT. Ozone was on level 4 here and level 2 in Cardiff. The sky had cleared by nightfall and the near super moon, last of the year, was up over the mountains at midnight, a sea fog had encroached and this resulted in an eerie glow () [Max 20.7C Min 8.4C Pptn trace]. The 8th was the 75th anniversary of the ending of World War II. Both of us were old enough to remember the events of the day with prime minister Winston Churchill broadcasting to the nation at 3 pm, and an address by King George at 8 pm in the evening. It has been weird seeing these old films broadcast on television today as. We did not have television in those days, we never saw them, it was radio then and of course broadsheet newspapers, the latest editions having very large banner headlines, THE WAR HAS ENDED. We took part in Street Parties, not on the 8th that was a Tuesday a working and school day, but on a later date when when the best spread that could be produced with wartime rations was put on the tables in the middle of the road. ITweet about 75th anniversary of VEDay ...It seems that there were some nice looking jam tarts at the one I was at in Sketty, Swansea, South Wales. My wife all dressed up, in clothes made by her mother, was in Hove, Sussex. A bright morning with thinning cumulus clouds and high cirrus, the fog had cleared and visibility was good; grass was wet with dew and fog deposition with a trace on the raingauge funnels. A little more cloud around noon then clearing giving a mostly sunny end to the day (Kew Gardens 24.5C, Katesbridge 3.4C, Drumnadrochit 20.2 mm, Bournemouth 13.4h Bala 11.5h Valley 10.9h) [Max 20.7C Min 9.7C Rain nil].

The 9th dawned bright and with a light NE'ly breeze soon warmed up when the sun had risen enough above the mountains and our local tall trees. At 0900 GMT it was 17.1C, a shirt sleeves morning for the obs, very pleasant. Pressure was on 1014 mb we were in a slack area of low pressure 1013 mb Western Isles, between highs 1032 mb N Greenland and 1020 mb E Med. Some cloud was lying far to the north-west. Pink Rhododendron starting to bloom in our Garden at Gadlys.Mostly sunny through the day, some cumulus clouds developed in the afternoon S of the Snowdonia Mountains and were towering for a while. Thunderstorms developed in S Wales and localised flash flooding affected streets and property in Carmarthen and Gorseinon, moving north-eastward missing N Wales. We held our street party complete with jam tarts #StayingAtHome in the sunny afternoon joining family and friend on Zoom doing the same at Newcastle, Llanfairfechan, Wilmslow, Salford, Ramsgate and Ashdown in Kent. The weather station communications hub stood up to the pressure despite the still dodgy land-line broadband here. Rather warm in the south, but we had the most sunshine (Northolt 24.9C Cardiff 24.6C, Shap 2.0C Capel Curig 4.6C, Keele 19.8 mm Llysdinam 5.6 mm, Valley 14.4d) {Max 21.4C Min 9.8C Rain nil]. A fine and bright morning though fairly cloudy morning on the 10th as altocumulus and cirrus clouds increased. We had an opening in the cloud cover overhead the station in a strong NE'ly wind the airflow coming from the Svarlbard region. The temperature 11.5C rose to 12.4C at 0923 GMT, from then it was colder. Gusty winds in places Warcop 47 mph, St Bees 43 mph and Donna Nook 40 mph. Becoming overcast by afternoon with spots of rain that just about wetted the ground about 15 GMT. Blue Iris and Asphodelus alba in bloom in our Garden at Gadlys.Gorwel Heights in Llanfairfechan recorded 0.6 mm (Plymouth 23.0C Milford Haven 21.0C, Fair Isle 4.9C Lake Vyrnwy 9.6C, Lerwick -1.6 C, Coningsby 10.4 mm S Athan 0.2 mm, Tiree 13.7h Aberporth 8.0h Valley 4.7h) [Max 12.4C Min 8.8C Rain trace]. The breeze had strengthened overnight, and on the morning of the 11th it was a force 5, the ground was strewn with leaves blown off the sycamore trees. With airflow from the Svarlbard region it was feeling cold too, the temperature at 0900 GMT 6.8C up from a minimum of 4.2C with a 3C wind chill. On Snowdon a temperature of -2C and a -11C wind chill could be expected. Pressure 1026 mb was rising with high 1036 mb just S of Iceland. A cold front was working it's way south over Scotland where it was wintry with snow showers. There was a low 996 mb over central France with a cold front over Brittany. There was an occlusion over SW France, a red alert for heavy rain had been issued for the region and about 12 cm of snow had fallen on the Pyrenees. There were strong winds in East Anglia and Thanet, Langdon Bay gusting 52 mph and Manston 41 mph. 'Ne'er cast a clout till May be out' is an old proverb, clout meaning clothes. The earliest citation is this version of the rhyme from Dr. Thomas Fuller, Gnomologia, 1732, although it probably existed in word-of-mouth before then. Good advice as I have had to return to winter clothes after changing to shorts and tee-shirt (Bournemouth 14.2C Pembrey Sands 13.5C, Fylingdales 7.2C Capel Curig 7.9C, Tulloch Bridge -5.2C Bala -0.6C, Resallach 2.6 mm, Dundrennan 14.7h Aberdaron 14.5h Valley 13.9h) {Max 10.4C Min 4.2C Rain nil].

A chilly night with some clear sky there was slight white frost on the fields at dawn on the 12th, the grass minimum read -2.7C, no airfrost here the minimum 2.0C, but Mona airfield recorded -1.3C. Tweet about our garden flowers ...Mostly cloudy at 0900 GMT and light breezes SE'ly here, but generally NW'ly, visibility was very good. Pressure 1023 mb was falling, high 1032 mb SE Greenland ridge towards Shannon and lows 1007 mb N Italy and Iberia. With a cold front over the Scottish borders there were a few showers in the west. Fine, dull and cool, The road was fairly quiet only 2 cars in 30 minutes. The afternoon turned out sunny and with lighter breezes more pleasant. Potting on tomato plants for planting on veg plot in June when weather is hopefully warmer (St James Park 16.3C Usk 15.2C, Sennybridge -4.7C Mona -1.3C, Fair Isle 8.8 mm, Bude 14.3h Aberdaron 12.2h Valley 8.8h) [Max 12.2C Min 2.0C Rain trace]. The 13th began very fine after a minor cold front passed southwards, now sunny with lines of cumulus clouds over the Snowdonia Mountains. The band of cloud was now lying over the SW across to the Thames estuary with cleaner air from the S of Iceland today visibility was excellent. There was a spot of precipitation in the raingauge bottle and a significant deposition of dust on collecting surfaces. There may have been some Saharan dust mixed with local dusts. Quiet apart from an RAF Texan aircraft from Valley somewhere in the skies over Anglesey. Pressure was on 1020 mb with high 1028 mb S Iceland. Today potting up chrysanthemum cuttings that had rooted around the edge of 3 in clay pots using 50/50% mixture of loam and vermiculite. Clay pots are essential, cuttings don't root well in plastic pots. Did my 1 mile #lockdown walk around the garden and wood, some bluebells have faded where the canopy is densest, there was still a good show at the 'far end' where less leaves have emerged. The garlic is still good with masses of flowers. The best weather today in NW Wales (Porthmadog 15.0C, Tulloch Bridge -5.0C Sennybridge -2.3C, Killylane 2.4 mm Rhyl 1.6 mm, Valley 13.5h) [Max 11.2C Min 4.7C Rain nil]. A fine day on the 14th beginning with broken cloud and light cool airs mainly from the nor'east. There were some cumulus clouds increasing and hardly moving across the sky. Pressure steady on 1026 mb within the Atlantic high 1028 mb off Malin Head drifting northwards. A warm front over Scotland associated with low 1012 mb Norwegian Sea gave some showers in the Highlands. Took cuttings of late flowering varieties of white chrysanthemums and did my mile #lockdown walk. A clearing sky in the afternoon and clear evening (Leeming 16.7C Llysdinam , Fair Isle 9.2C Aberporth 10.9C, Katesbridge -6.1C, Loch Glascarnoch 4.2 mm, Aberdaron 15.0, Valley 14.3h) {Max 12.8C Min 2.3C Rain nil]. A mostly cloudy morning on the 15th, but under the cloud visibility was very good. There was a cool nor'eastly making the 10.7C feel chilly. Pressure was steady on 1026 mb with Atlantic-low 1030 mb off SW Ireland. The cloud was due to a remnant warm front no going anywhere at all along the western fringe, so the day was dull and sunless here. Sunny in southern Britain and the north-east. Planted out 2 rows of lettuce raised in modules and hoping with the dry weather the slugs will keep away. Watered in and protected with wire netting to keep off pheasants (male with 3 females in tow) and rabbits the latter not seen this year, yet. Not nice enough for my cup of tea in the garden this afternoon (Heathrow 19.6C Cardiff 16.9C, Santon Downham -3.4C Sennybridge -2.5C, Altnaharra 5.2 mm, Shoeburyness 14.9h St Athan 13.9C Valley 0.4h) [Max 12.9C Min 4.9C Rain nil].

Temperatures have been below average during the first 15-days of the month and very dry with rainfall of just 0.3 mm. The mean temperature 10.5C (-1.1) & [-1.2] less than in April. No air frosts, there had been 3 ground frosts.

A much nicer day on the 16th beginning with scattered cumulus and high cirrus clouds. Visibility continues very good and all surfaces were dry, except the lysimeter that was wet with guttation droplets. AWS temperature and pressure record for past 28-days.Fine and sunny in fact better than the forecasts had indicated, I'm not complaining. In the sun it felt warm the 12.9C at 0900 GMT rising to 15.9C in the afternoon. At Gorwel Heights a temperature of 17.1C was recorded. Pressure was 1025 mb in a ridge from Brest high 1028 mb stretching towards the Irish Sea. Not so lucky in Scotland where a cold front associated with low 982 mb Norwegian Sea was delivering showers. The south-west Channel coast of England was also cloudy. The temperature record indicates the sawtooth pattern we have experienced for the past 28-days. The pressure record shows the deep 987 mb low that upset the apple cart at the end of April. Replanted a nice red-stemmed spring flowering Drimys (poss. Tasmanian D. lanceolata) that had been hospitalised. One has grown well now 6 ft tall on our slightly acid soil the other did not. Dug up it was trying to grow in brick waste contaminated soil, so repotted in clean soil, and it has recovered although only 1 ft tall. Also started preparing ground for sweetpeas raised in pots. I thought it so nice in the sun in the late afternoon that I fired up the barbecue and cooked steaks, could not persuade the head gardener to eat out in the garden, the then 12C not yet warm enough it seems (Pershore 19.2C Usk 17.6C, Baltasound 5.7C Aberporth 13.2C, S Newington 1.1C, Achnagart 6.6 mm, Camborne 11.6h Valley 10.3h) [Max 15.9C Min 7.4C Rain nil].

Very fine and sunny on the 17th and with slight haze good visibility. Pressure 1023 mb was falling slowly with high Brest and lows 998 mb Norwegian Sea and 991 mb S of Greenland. Frontal cloud over N and NW Scotland with some rain. Here fairly breezy with cumulus and cirrus clouds, warm in the sun kept dry (Holbeach 21.1C Hawarden 18.9C, Kirkwall 8.6C Capel Curig 13.4C, South Newington 1.3C, Dunstaffnage 15.4 mm, Tibenham 12.8h Aberporth 3.8h) [Max 16.3C Min 8.6C Rain 0.3 mm]. The 18th was a very dull day under thick cloud at 0900 GMT solar radiation was was just 120W, a far cry from recent mornings,also thick enough for slight rain and drizzle with 0.3 mm measured. Recorded the ground as wet this morning, the first time in 15 days. A patch of showery rain was slow-moving over Anglesey. Showers also NW Britain although the SE was sunny. Light showers in the morning. It was 33C in Greece; overnight minimum of 10.1C around 03 GMT, 10.9C at 0900 GMT rising to 11.8C at 1826 GMT. Total rainfall here this month 3.0 mm, so far (Cavendish 24.6C Usk 19.1C, Lerwick 7.9C Capel Curig 10.9C, Baltasound -1.0C Libanus 7.2C, Achnagart 24.8 mm Capel Curig 5.2 mm, Exeter 13.3h St Athan 8.8h Valley 0.0h) [Max 12.0C Min 10.1C Rain 2.4 mm]. A dull breezy morning on the 19th after some light showers in the night. Recorded the ground as wet again this morning and despite the rain there were still cracks in the surface. The temperature had been 12.0C at 0833 GMT, the highest of the past 24h. Pressure 1023 mb was rising , the high 1027 mb over Brittany was diminishing. Low 995 mb S of Iceland had a frontal triple point over Scotland. Slowly a little less dull, no more rain, and by afternoon some sunny spells developing. Up to 8 May there have been 174 cases of COVID-19 recorded in Anglesey and 12 attributed deaths (St James Park 26.2C Usk 23.1C, Altnaharra 1.8C, Blencathra 19.0 mm Capel Curig 1.0 mm, Wellesbourne 13.4h Aberporth 13.0h Valley 3.6h) [Max 16.3C Min 10.6C Grass 10.2C Rain nil].

The 20th began very fine, sunny and warm. Tweet about our garden Mediterranean Cistus collection ...There had been a slight dew formation the temperature on the grass down to 3.8C, there was heavy guttation on the lysimeter grass. Tweet about wilting sycamore trees and the drop of rain ...Cirrus clouds 3 oktas and visibility very good and clear. Conditions remain very dry, the cores off soil sampled today looked very dry, some powdery. Soil moisture was 24.8% dm under grass and on the met plot 13.5% below the permanent wilting point for the local soil type. In the afternoon the leaves of mature sycamore, wild cherry and horse chestnut were wilting. Native beech and ash seemed unaffected. There was a Föhn breeze late in the afternoon the relative humidity falling to 43% and the temperature in the Stevenson screen reading 21.9C at 1600 GMT. A pleasant evening, fired up the BBQ. Hot weather in the south (Santon Downham 28.2C Llysdinam 25.2C, Baltasound 9.8C Aberdaron 17.3C, Shap 4.2C, Dunstaffnage 1.6 mm Tredegar 0.2 mm, Morecambe 15.1h Hawarden 14.3h Valley 13.8h) [Max 21.7C Min 8.4C Grass 3.8G Rain 3.1 mm]. Meteosat MSG image (c) EUMETSAT at 12 GMT on 21 May 2020, courtesy of Ferdinand Valk.A mostly cloudy sky after recent showery rain on the morning of the 21st with sunny spells developing. Pressure 1021 mb was rising as low 967 mb tracked northwards west of Ireland, a cold front over the Irish sea at 06 GMT had moved eastward. The unseasonably low depression was an unwelcome sight at this time of year, although we could do with some rain to slake the parched soil. Derek Brockway BBC Wales weatherman.It was fine and sunny in SE England, hot in Ramsgate, here on the western fringe were some showers while there were more active showers over East Anglia with sferics observed. Fine and sunny in the afternoon. Derek Brockway the BBC Wales Weatherman featured the low 6 mm of rainfall in Llansadwrn this month to yesterday, compared with the average of 62 mm, in the 6.30 pm news bulletin (Manston 27.8C Usk 23.8C, Eskdalemuir 1.4C, Stornoway 7.4 mm Mona 2.2 mm, Reading University 11.8h Aberdaron 8.5h Valley 7.0h) [Max 19.1C Min 11.2C Rain 5.8 mm]. After midnight on the 22nd there was a spell of moderate to heavy rain that added 5.8 mm to the month's total that now stands at 11.9 mm, still a very low total for May and well below the average. A very windy day blowing strong to gale force, a gardener's gale to boot, we had tied up what plants we could on the forecast and in fact damage was minimal, the most damage were the green leaves and twigs broken off the trees that were strewn on the ground. Valley reported gales at 12 and 13 GMT and gusts up to 52 mph, we had 42 mph here and at Gorwel Heights in Llanfairfechan. Used a hard-hat to go out to do the obs at 0900 GMT, not pleasant, a lot of debris flying around and the woods were out of bounds. There was a very rough sea at Rhosneiger and there were waves generated on Llyn Tegid, Bala. Gusts of 60/70 mph were recorded in parts of coastal western Ireland. The temperature had reached 19.1C at 1353 GMT then fell to a low of 13.2C at 1800 GMT before rising again a SSE'ly Föhn-enhanced to 19.2C (screen) at 2230 GMT with relative humidity down to 41%. The day's minimum was at 0448 GMT next morning. In all an interesting day's weather (Heathrow 23.2C Cardiff 18.7C, Kinbrace 6.3C, Achnagart 73.4 mm Capel Curig 12.8C, Aberdaron 13.8h Valley 12.6h) [Max 19.2C Min 11.2C Rain 5.8 mm].

A very windy morning on the 23rd the SW'ly force 5/6, but fine and mostly sunny. Pressure 1015 mb was rising with low 976 N of Scotland, pressure was high near Cap Finisterre 1032 mb. There were scattered showers in the north and also south Midlands. Here blustery sunny spells and a slight shower in the afternoon (Weybourne 20.1C Bodelwyddan 16.6C, Dalwhinnie 4.9C, Achnagart 68.2 mm Lake Vyrnwy 11.6 mm, Reading University 11.4h St Athan 10.1h Valley 7.0h) [Max 14.9C Min 9.9C Rain trace]. Fine, but dull on the morning of the 24th, moderate visibility and quite hazy. Very dry, a bit breezy and as a result feeling chilly although 13.1C at 0900 GMT. The afternoon was brighter with some sunshine and the temperature rose to 17.4C. Sowed runner beans (Moonlight) in pots in the greenhouse, made sure they were in the propagating frame so that the mice did not find them. We have woodmice permanently in and out of the greenhouse and they love seeds. Small carder bumblebees were attracted to this very small flowered figwort in the garden.The broad beans on the vegetable plot have a good lot of flowers and the bumblebees are taking some interest in them. A number of small carder bumblebees were attracted to a very small flowered figwort (left) growing in the garden and ignoring the broad beans. Had family Zoom meeting everyone except one NHS keyworker in #lockdown (Teddington 23.5C Usk 20.5C, Aviemore 7.1C, Keswick 8.8 mm, Almondsbury 12.3h Aberporth 12.0h Valley 6.7h) [Max 17.4C Min 10.9C Rain nil]. . Very fine on the 25th, continuing the dry spell all monitored surfaces dry. Just one or two cumuli seen at 0900 GMT, very good clear visibility, breezy and sunny, high solar radiation 1009 W m -2 for this time in the morning. Pressure was steady on 1034 mb with the high 1035 mb centred over Somerset. Isobars were tight over N Scotland with low pressure 983 mb SE Greenland and SW Iceland, breezy in the NW and sunny almost everywhere. The maximum at Gorwel Heights today was 21.2C (Teddington 26.6C Cardiff 23.1C, Aboyne 0.0C Swyddffynnon 0.4C, Harris Quidnish 2.6 mm, Shawbury 15.0h St Athan 14.8h Valley 12.3) [Max 17.6C Min 8.4 Grass 2.0C Rain trace].

It was a rather murky morning on the 26th with poor visibility, moderate haze with fog reported in places including Aberporth. The sky was overcast with altostratus cloud and the grass damp, there was a drop of precipitation in the raingauge bottle. Pollution levels were low, there was a patch of Saharan dust over Britain (SKIRON Model University of Athens) and there was a dusty deposition likely a mixture of local and Saharan dusts. Pressure was high 1037 mb over the Scilly Isles, and here 1037 mb rising, a plume of warmer air was encroaching southern Britain where hot and sunny. There has been a complete absence of housemartins and swallows here, numbers seen had decreased last year. Heavy losses have been reported on migration routes this year. Climatic changes in the swallows' African winter quarters and on migration routes may be having a serious impact. Research has shown that swallows are returning to their breeding areas in poor condition and are laying fewer eggs than previously. Independent of weather-related fluctuations, there have been widespread declines in swallow numbers across Europe since 1970 (Kew Gardens 26.9C Usk 23.8C, Tulloch Bridge 4.0C, Tyndrum 1.6 mm Gogerddan 0.2 mm, Exeter 14.6h St Athan 14.1h Valley 5.6h) [Max 17.6C Min 11.2C Grass 7.9C Rain nil]. Very fine and sunny on the 27th, very dry conditions with no sign of rain any time soon. Warm, 16.7C at 0900 GMT rising to 21.7C in the afternoon. Pressure steady on a high 1038 mb centred on Malin Head (1039 mb at midnight) covering a large area of Europe and north Africa. Cloudy to the N of here, but cloudless skies over much of eastern Europe, France and Iberia. Planted out sweet peas grown in pots in the greenhouse and potted up chrysanthemum cuttings (Heathrow 26.3C Usk 25.3C, Shap 1.0C Capel Curig 3.4C, Stornoway 2.4 mm Wales nil, Nottingham 14.7h St Athan 14.2h Valley 13.4h) [Max 21.7C Min 7.9C Grass 3.7C Rain nil].

Herbaceous border in our garden at Gadlys.

 

White French rock rose flowering well in our Garden at Gadlys.It was much of the same on the 28th, very fine, warm and sunny, ideal for a trip out, walking, perhaps the beach. All of this unlawful due to coronavirus #lockdown, we are missing recording the plants appearing at the botanical sites we usually visit #StayingAtHome. High 1037 mb now over the North sea dominating the weather, pressure here 1033 mb. A few clouds mostly cirrus and contra, just one or two contrails from jets passing overhead on route B1 probably transports from North America. The temperature at 0900 GMT 21.7C 59% RH, and dry dry dry. Did 5 laps of the garden and wood today keeping up my 1 mile a day effort to keep fit. The scented deciduous Azalea and Halimocistus sahuccii French rock rose, a dense, low-growing dwarf evergreen shrub with narrow, dark green leaves and pure white flowers 2.5 cm in width, with yellow stamens, gave much pleasure each time I passed by (Leuchars 25.7C Trawsgoed 25.5C, Ravensworth 2.3C, Resallach 17.8 mm Wales nil, Weybourne 15.1h Aberdaron 14.8h Valley 13.9h) [Max 23.2C Min 11.7C Rain nil]. Thrush taking a drink from an old pig trough in our Garden at Gadlys.The 29th began very warm and sunny with excellent visibility, with a few high cirrus clouds. The temperature at 0900 GMT was 21.9C with an RH of 47%. The exceptional dry conditions continue comparable with Greece that currently has similar temperatures. Pressure was high 1033 mb over the eastern North Sea and here 1027 mb. Helped by a warm plume of air from the region of the Canary Islands and Western Sahara the temperature here reached 25.3C at 1340 GMT. Sunny and warm on the western fringe today (Kinlochewe 28.0C Gogerddan 26.1C, Lerwick 11.3C Libanus 21.2C, Santon Downham 2.9C Usk 5.9C, East Malling 0.2 mm, Morecambe 15.5h Aberdaron 15.1h Valley 14.5h) [Max 25.3C Min 12.8C Rain nil]. Very fine and warm again on the 30th the temperature 20.7C RH 55% at 0900 GMT, one could get used to this weather. Pressure was on 1923 mb with high 1036 mb central Norway. Clean airflow from Arctic regions of Svarlbard, North Cape and the Baltic ensured excellent visibility. Sunny everywhere the temperature in Altnaharra, Scotland currently was 24C while in Manston, Thanet it was 18C.Thrush taking a bath in old pig trough in our Garden at Gadlys. The temperature here rose to 25.4C at 1533 GMT, the highest of the month (Kinlochewe 27.5C Porthmadog 26.2C, Fair Isle 12.3C Lake Vyrnwy 20.8C, S Newington 2.6C Sennybridge 4.8C, Thorney Island & Valley Trace, Morecambe 15.7h Aberdaron 15.2h Valley 15.1h) [Max 25.4C Min 12.5C Rain nil]. After a mild night air minimum 13.9C it was a cloudless morning on the 31st, very fine, but a little cooler the temperature at 0900 GMT was 17.5C RH 65%. Visibility was very good with slight smoke haze. High 1035 was little changed over Norway and here pressure was steady on 1023 mb. Very dry conditions, some brown patches were developing on grassy area, some mature trees were showing signs of wilting and roadside verges looked more like the Autosoleil in the S of France. Sunny with the UK almost cloudfree everywhere. Hot in Porthmadog 28.0C, cooler Llanfairfechan 22.7C. There were thunder storms in Morocco, NW Spain and the eastern Mediterranean (Porthmadog 28.0C, Fair Isle 13.2C Lake Vyrnwy 21.4C, Braemar -1.3C, Insignificant rain, Kirkwall 16.6 Aberdaron 14.9h Valley 14.4h) [Max 22.6C Min 13.9C Rain nil].

A sunny, warm and very dry month. The rainfall total of 11.9 mm, (17%) & [19%], was least on record in May in Llansadwrn records back to 1928. Sunshine at RAF Valley was most in May in Anglesey records back to 1931. Temperatures above averages, the mean highest since 2017 was 12.7C (+1.1) & [+0.9] ranked 7th in station records since 1979..

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June 2020

June 1 - a very fine and warm day, cloudless sky very clear visibility, a continuation of the remarkably fine weather of May, but I expect we will pay for it soon, the forecast charts don't look promising from midweek. Pressure was on 1025 mb with high 1033 mb S Norway. Sunny and warm out of the NE'ly breeze. The temperature at 0900 GMT was 18.0C with 59% RH excellent for drying the washing and getting on with those jobs in the garden (Porthmadog 27.6C Aboyne 1.1C High Mowthorpe 0.2 mm Waddington 15.6h Aberdaron & Valley 15.5h ) [Max 21.1C Min 12.3C Rain nil]. Just a little cloud on the morning of the 2nd, low hiding behind the Snowdonia Mountains to the south. Warm again 20.4C at 0900 GMT and continuing warm, rising to 23.9C was very pleasant in the garden. We keep susceptible plants watered and where necessary on the vegetable pots. Leaves on mature woodland trees show a little wilting in the drying breeze. We could do with a drop of rain, but not the end of the summer. Pressure 1022 mb with low 1020 mb S Iceland and a cold front over N Scotland associated with low 1001 mb Svarlbard, expected to move south. Made the most of the lovely summer day, the last for a while Gosport 26.9C Ravensworth 2.9C Strathallan 13.4 mm Bournemouth 14.6h St Athan 14.1h Valley 12.1h() [Max 23.9C Min 11.9C Rain 2.8 mm]. Well we had the drop of rain after midnight on the 3rd that by the morning had accumulated just 2.8 mm measured in the raingauge at 0900 GMT. A change in the weather with colder air introduced from the north overcast sky with a frontal system over Anglesey. A dust deposition, local plus some Saharan dust was possible, being cleared away south-eastwards during the day. Poor conditions prevented any outside work, a clearance from 5 pm brought a little sunshine to end the day. The maximum 12.1C was lowest of the month (Cavendish 20.9C Whitechurch 16.8C, Altnaharra 4.9C, Shap 19.2 mm Hawarden 18.6 mm, Magilligan 11.5h Valley 4.3h) [Max 12.1C Min 11.3C Rain 2.9 mm]. Overcast sky again on the morning of the 4th with a slight shower of rain at 0900 GMT. Pressure was on 1007 mb with complex lows 996 mb Netherlands and frontal-wave 999 mb SW Norway. A cold front was clearing over the Dover Strait into France. Pressure was high 1030 mb over the Atlantic to the W of Ireland. Dull all day, sunless here (Murlough 18.6C Cardiff 16.7C, Aboyne 1.3C Sennybridge 2.4C, Drumalbin 17.0 mm Sennybridge 3.0 mm, Kirkwall 6.1h St Athan 1.9h) [Max 15.4C Min 8.7C Rain trace], A bright start to the 5th with broken cumulus clouds (7 oktas cover) solar radiation was 809 W m -2 much being reflected back by the clouds. The temperature was 11.4C (RH 70%), pressure steady on 999 mb with low 984 mb over the Norwegian Sea. There was a cold front over the English Channel and here a cold NNW'ly breeze. Sunny spells in the afternoon, solar radiation brightness reached 1116 W m -2 at 1300 GMT with the cumulus clouds persisting (Bournemouth 19.2C Cardiff 17.7C, Redesdale 2.0C, Hull 24.4 mm Sennybridge 9.8 mm, Shobdon 11.7h Valley 10.4h) [Max 15.2C Min 7.7C Grass 3.8C Rain 0.4 mm].

A colder and wet breezy day on the 6th with poor to moderate visibility in slight drizzle. Pressure on 998 mb was slowly rising with low 982 mb over the North Sea off Tynemouth. There was a frontal-wave triple point over Morecambe Bay. Pretty windy elsewhere with gusts of 52 mph reported at Loftus, 45 mph at Malin Head and 43 at Aberporth. Brighter and drier in the late afternoon (Pershore 19.3C Hawarden 16.0C, Libanus 3.8C, Drumnadrochit 42.6 mm Capel Curig 30.4 mm, Hawarden 8.9h Valley 1.0h) [Max 13.9C Min 7.0C Grass 2.8C Rain 0.9 mm]. Pressure 1010 mb was rising on the 7th with filling low 997 mb southern North Sea near the Netherlands coast. Overcast with spots of rain and drizzle and moderate to good visibility. The morning became dry by 10 GMT and the afternoon was bright with spells of sunshine developing later as the sky cleared. There was a bright moon seen over the mountains just before midnight (Wiggonholt 20.5C Usk 20.3C, Shobdon & Usk 3.4C, Fylingdales 16.4 mm Cardiff 3.4 mm, Prestwick 10.6h St Athan 8.0h Valley 6.3h) [Max 16.1C Min 9.6C Grass 8.7C Rain trace]. Cool overnight under clear sky with a minimum 6.2C and 1.8C on the grass. Fleabane Erigeron glaucus growing on the rockery bank in our Garden at Gadlys.A mostly cloudy morning on the 8th, but with the sky clearing it was fine and becoming brighter with weak sunshine. Visibility was good with moderate haze. A mostly sunny afternoon and a dry day (Hereford 20.0C Cardiff 19.5C, Tulloch Bridge -1.9C, Cardinham 17.4 mm Usk 9.2 mm, Stornoway 15.1h Aberdaron 14.7h) [Max 16.8C Min 5.9C Grass 1.8C Rain nil]. It was fine but fairly dull on the morning of the 9th with good, hazy visibility. There was weak sunshine at 0915 GMT the sun not breaking through. Pressure was steady on 1021 mb with high 1022 mb over the North Sea off the Lincolnshire coast. Low 1001 mb SW Iceland had frontal cloud off NW Ireland and Scotland. Had to put water on our Crinodendron hookerianum tree, known as the Chilean lantern tree, an evergreen tree with leathery, dark green leaves of the family Elaeocarpaceae. It is endemic to Chile, where it occurs from Cautin to Palena. It grows near streams and in very humid and shady places. Our 15 ft tall branched tree is full of crimson lanterns about 1 inch long in leaf axils, but suffering somewhat this year due to the dry weather. Normally there is enough rain and humidity in northwest Wales for it to grow happily so I felt a helping hand with hose pipe was necessary. A sunny and dry afternoon (Wisley 20.8C Cardiff 20.0C, Redesdale -0.5C Swyddffynnon 0.9C, Lough Fea 7.2 mm, Lerwick 15.9h St Athan 10.6h) [Max 15.2C Min 6.9C Rain 0.3 mm].

A recent light shower of rain on the 10th did not wet the soil surface, but dampened the concrete and grass. Signs of the mostly cloudy sky opening up with a little brightness, then thickening and closing again. Pressure 1014 mb was falling with a low closeby over the North Channel at 0900 GMT. Occlusion cloud over the Irish Sea and a lot of rain at Mumbles near Swansea. There was high-pressure N of the Azores 1033 mb and Norwegian Sea 1027 m b. Little in the way of any sunshine, more at Tiree island not far to the north-west of Anglesey. Showery rain in the evening (Manston 17.5C Porthmadog 16.8C, Castlederg 5.6C, Mumbles Head 49.0 mm, Tiree 5.6h Valley 2.0h) [Max 16.6C Min 10.1C Rain 4.0 mm]. AWS temperature and solar radiation record for the 11 June 2020.Having remarked previously (26 May) about the absence of housemartins this year a group of about 20 was spotted on the 11th in the sheltered corner of the field adjacent to the weather station. There was a stiff NE'ly breeze strengthening through the day and the birds were in the sheltered working low over the cattle grazed pasture. They were flying towards the house and inspecting the eaves. They were joined by more later in the day. No swallows though, one was seen in the village on the 10th. Overcast and very dull although pressure 1017 mb was rising with a low 995 mb over Brittany and frontal occlusion stretching from the Isle of Man, Wales to Brighton on the south coast of England. A crazy temperature profile today a mild 12.4C at 0900 GMT rising to 12.8C then a cold spell falling to 10.8C at 13 GMT with rain before rising to a maximum of 16.0C at 1506 GMT after the sun had come out and a minimum 10.6C at 2126 GMT. Heavy rain SW and central S England and S Wales again. Tiree sunny again (Bournemouth 21.5C Porthmadog 18.5C, Fyvie Castle 3.5C, Cardinham 49.8 mm Pembrey Sands 22.6 mm, Tiree 12.5h Aberdaron 3.3h Valley 1.8h ) [Max 16.0C Min 10.6C Rain 3.5 mm].

Overcast, dull, damp and breezy on the 12th, but it was fine and by 10 GMT some glimpses of sunshine. Again the housemartins were giving a fine display in the sheltered corner of the field/ Two or three flying over and inspecting the eaves of the house. Pressure 1010 mb was falling with low 977 mb Biscay and Charente Maritime, France. There was a trailing occlusion over the Irish Sea and the sky became increasingly dull in the afternoon thickening enough to bring on drizzle at 15 GMT. The highest temperature was 16.4C at 1127 GMT, that would have been regarded as a good summer temperature here 30/40-years ago. The 24-h maximum 17.7C was at 09 GMT tomorrow when warmer Continental air was being drawn across central Britain. Not good for outside work, sowed purple sprouting broccoli 'Rudolph', kale, chard (Beta vulgaris) and spinach in modules in the greenhouse. Wet in Loftus (41.6 mm) the town lying within the county of North Yorkshire. It lies in a region between Saltburn-by-the-Sea and the North York Moors, it was formerly known as Lofthouse (Tyndrum 23.2C Milford Haven 22.3C, Braemar 2.4C, Loftus 41.6 mm Cardiff 15.0 mm, Loch Glascarnoch 12.2h Aberdaron 8.6h Valley 2.5h) [Max 17.7C Min 10.5C Rain 0.2 mm]. The 13th began sunny and warm with an ENE'ly breeze, scattered clearing clouds, cirrus, altocumulus and cumulus, as an area or rain pushed northwards in N England and Newcastle where over the North Sea a group of sferics had earlier been recorded. With pressure on 1008 mb there was complex slow-moving low-pressure over Biscay and the Charente Maritime where the weather was poor. Warm air from the S was pushing against colder air in the N, a recipe for thunderstorms. A MetO Yellow warning had been issued for N Wales. We had a slight shower at 1450 GMT, just a few drops, and no thunder was heard. Storms did develop in the evening on a line from London to Liverpool (Porthmadog 25.5C, Edinburgh Botanic Gardens 12.4C Tredegar 18.6C, Exeter 7.7C Whitechurch 7.9C, Chillingham Barns 14.0 mm Scolton 8.2 mm, Wattisham 13.6h Aberdaron 9.4h) [Max 20.4C Min 12.9C Rain trace]. Sferics at 1443z on 14 June 2020. Courtesy of blitzortung.org/. A warm start on the 14th with 20.4C recorded at 0900 GMT, the second daily maximum morning. Pressure 1013 mb was rising with a high 1010 mb over the Celtic Sea. Very fine, very clear visibility, but that was to change as with a Yellow warning still in force thunderstorms developed on a line over the Carneddau and Anglesey at 1308 GMT lasting for an hour. Rain fell briefly at a rate up to 75 mm/h at 1325 GMT with 9 mm falling in the hour and event total 14.4 mm. Had started planting out tomato plants on the vegetable plot, retired to shed, resumed later when the storm had passed, the soil previously dry then very wet (Santon Downham 25.5C Hawarden 22.8C, Okehampton 6.9C, Shawbury 31.0 mm Llansadwrn 14.4 mm, Stornoway 15.8h St Athan 9.3h) [Max 20.4C Min 14.2C Rain 14.4 mm]. . Another mild night and very fine at first on the 15th after yesterday's rain, foggy around the coast with moderate visibility here. Cooler this morning with 17.9C at 0900 GMT. Convective clouds were developing to the S and SE and there was an area of rain in S Snowdonia with Capel Curig getting 23.6 mm. Sferics were noted in the area of Shrewsbury and Cheshire, thunder was heard here at 1145 GMT rumbles continuing for about an hour. Only slight rain here, heavy in places including Wilmslow where there was heavy thunder and lightning. The evening was again brighter with glimpses of sunshine. Warmest at Astwood Bank a village south of Redditch. The village is noted for its successful cricket team, who have twice played at Lords in the National Village Knock Out Final (Astwood Bank 25.4C Cardiff 22.4C, Okehampton 6.3C, Castlederg 48.2 mm Capel Curig 23.6 mm, Lerwick 14.6h St Athan 10.0h) [Max 20.4 Min 11.9C Rain 0.5 mm].

The first 15-days of the month have had nearly half of the normal June rainfall 33.0 mm (43%) and [49%] of averages, but not enough to fully restore the water balance. The mean temperature 13.8C a little below normal (-0.5) and [-0.1] of averages .

Overcast at first on the 16th with a mild 15.8C air temperature at 0900 GMT. here was a low 1014 mb over the SW Approaches and another 1012 mb over the Baltic, we were in a large slack low-pressure area with 1015 mb here. Visibility was moderate in haze and there was just a light NE'ly breeze that felt fairly warm, if not muggy. There had been a light deposition of dust, a greyish colour with tones of light reddish brown. The SKIRON model indicated patchy Saharan dust over the UK and it's likely it was mixed with local and European dusts. Yellow warnings were out for thunderstorms and sferics were already in the vicinity of the Black Mountains of S Wales. There was a little brightness and glimpse of sunshine around 10 GMT. Sferics spread widely across Britain during the day. Thunder was heard at 1418 GMT and again later from the SE in the direction of the Carneddau Mountains. Fog developed late in the afternoon then cleared during the evening. Storms continued in the Midlands and N England late into the evening dying out before midnight (Heathrow 24.9C Usk 23.4C, Whitechurch 7.0C, Market Bosworth 49.6 mm Llysdinam 45.0 mm, Lerwick 13.1h St Athan 6.5h) [Max 20.5C Min 11.6C Rain 2.5 mm]. Fog returned just after midnight on the 17th and there was a spell of light to moderate rain from 01-03 GMT, it was still foggy at 0600 GMT. At 0900 GMT visibility was poor in mist, but the cloud was thinning a little and was brighter. The temperature was 15.1C (dewpoint 14.3) RH 95%. There was a shower of rain at 0920 GMT. Thunderstorms developed again in SW England, S Wales and Thannet. There was flooding of streets and property in the Rhondda Valley where the villages of Pentre and Maerdy were flooded some for the third time this year. Storms Ciara and Dennis left Wales with an estimated £180m clean-up bill and more than 1000 properties affected in Rhondda Cynon Taff (Source: BBC 19.6.20) an area also badly hit by the COVID-19 pandemic. Sporadic thundery outbreaks occurred again over SE and central England, S Wales and Cumbria. Thunder was heard from about 1325 GMT followed by showery moderate to heavy rain up to 12 mm/h, further light showers around 2200 GMT. Localised storms occurred along the N Wales coast (near Rhyl) in the evening (Writtle 24.8C Bala 23.2C, Lerwick 7.3C, Sutton Bonington 40.6 mm Libanus 19.8 mm, Morecambe 9.8h Hawarden 5.2h) [Max 19.4C Min 12.6C Rain 3.4 mm].

Fog returned after midnight on the 18th and by morning visibility had improved, but was still poor with mist and slight rain at 0900 GMT. Pressure was on 1011 mb with low 1008 mb over the North Sea just off East Anglia where they were getting some welcome rainfall. An area of moderate to heavy rain was spreading from the ESE westward. MetO yellow warnings were in place for thunderstorms in southern Britain; Anglesey, Pembrokeshire and Cornwall were excluded from heavy rain warnings. We would be in the rain shadow of the Snowdonia Mountains as it was coming unusually from the east and not the prevailing southwest on this occasion. It was a dull day, slight rain and drizzle in the morning and a wet afternoon, heaviest at 1507 GMT when falling at 4.2 mm/h though the total was moderate. Not fit to do any outside jobs today (Achnagart 24.5C Porthmadog 17.9C, Aboyne 4.9C, St Athan 50.0 mm, Altnaharra 13.4h Aberdaron 0.5h) [Max 15.8C Min 13.7C Rain 9.6 mm]. Another poor day for gardening on the 19th, but not the garden that has needed the rain with the soil still on the dry side. At 0900 GMT poor misty visibility with heavy drizzle. With pressure steady on 1008 mb we had a low-pressure centre over the Irish Sea, pressure was high 1021 mb France. Similar miserable misty wet weather in the afternoon, very wet in Porthmadog (25.0 mm), but it did start to clear too late in the evening when a few glimpses of sunshine were seen (Altnaharra 22.2C Hawarden 18.4C, Altnaharra 7.6C, Salsburgh 26.6 mm Porthmadog 25.0 mm, Manston 9.4h St Athan 3.5h) [Max 15.3 Min 12.1C Rain 5.0 mm]. Tweet about outbreak of COVID-19 in Llangefni ...The 20th began mostly cloudy and continued variable trying to clear at 0900 GMT when 15.3C, it was sunny along the north and west coasts and visibility here was good. There was a band of cloud lying over North Wales to Sussex, elsewhere sunny. Pressure was steady on 1017 mb with Atlantic-low 985 mb S Iceland and to the SW of Ireland. With high 1023 mb over central France there were strengthening winds in the west as isobars tightened. It was breezy; the cloud broke up in the afternoon and allowed sunny spells though continuing rather breezy (Heathrow 23.0C Hawarden 22.7C, Katesbridge 5.2C, Kinlochewe 21.2 mm Trawsgoed 4.2 mm, Shoeburyness 12.1h Aberdaron 10.6h Valley 10.1h) [Max 19.8C Min 11.3C Rain 3.2 mm]. A blustery day on the 21st with a strong SW'ly wind. On a rising tide a few kitesurfing boards were out on the water at Rhosneiger, not seen for a while due to #Lockdown. Pressure 1010 mb was rising with low 976 mb S of Iceland and W of Scotland. The sky was again mostly cloudy with a triple point near Morecambe. Fine with some weak sunshine at times in the morning, sunny spells in the afternoon with towering cumuli seen over the Snowdonia Mountains. A threatening cumulus cloud passed over here and produced a few spots of rain at 1335 GMT. Staked and tied up recently potted up chrysanthemum plants as it looked like a windy spell coming up. A developing frontal wave low over the Atlantic at noon 1007 mb began sneakily tracking towards SW Ireland reaching there 1003 mb at midnight (Heathrow 23.9C Hawarden 19.1C, Aboyne 7.4C, Whitechurch 23.4 mm, Aberdaron 11.2h) [Max 17.1C Min 12.1C Rain trace]

A very windy day on the 22nd, at 0900 GMT with pressure steady on 1019 mb there was a S'ly force 6 to 7, force 8 had been forecast for the Irish Sea, unseasonable for this time in June, but not unusual. Overcast, conditions were dry here, but rain was on the radar off South Stack and the Llyn. The sneaky low was 1003 mb off Malin Head with a triple point SE Ireland at 06 GMT, pressure was high 1028 mb relatively closeby over Brittany, as a result isobars were tight to the W and NW including the Celtic Sea. The day continued dull and breezy with strong gusts. There was light rain from 16 to 20 GMT (Heathrow 23.9C Cardiff 22.8C, Aboyne 2.3C, Eskdalemuir 17.2 mm Whitechurch 14.6 mm, Shoeburyness 15.5h St Athan 9.4h) [Max 16.4C Min 10.9C Rain 1.0 mm]. Meteosat MSG image (c) EUMETSAT at 12 GMT on 23 June 2020, courtesy of Ferdinand Valk.The sky was overcast again on the 23rd, visibility was poor and there was slight drizzle although nothing was indicated on the rainfall radar. Pressure 1021 mb was rising with lows 1010 mb Norwegian Sea and 984 mb S Iceland, there was a cold front lying across the N Channel to the Azores. Pressure was high 1026 mb over the Netherlands, northern Britain was wet while with a plume of warmer air encroaching southern Britain it was sunny and warm in the SE resulting in an early temperature range NW 12C to 24C SE. The afternoon eventually turned sunny and warm here 21.3C at 1500 GMT as the cloud moved northwards clearing Anglesey (Heathrow 28.6C Cardiff 25.3C Fair Isle 13.3C, Kinbrace 7.7C, Eskdalemuir 22.8 mm Whitechurch 5.2 mm, Wattisham 15.4h St Athan 14.9h Valley 3.4h) [Max 21.3C Min 14.2C Rain 0.1 mm].

Herbaceous border in our garden at Gadlys.

The 24th began very fine and sunny with 4 oktas cover of cirrus clouds. Pressure was on 1021 mb in a ridge of high-pressure from high 1028 mb over S Norway to Wales. There was lingering frontal cloud to the NW that was not to bother us. The warmer air had reached us and winds were light. The local farmer took advantage of the light wind and sprayed the adjacent barley field which is growing up well. Sunny with the temperature reaching a warm 23.8C here in the afternoon. Hot in parts of southern Britain (Heathrow 32.6C Cardiff 30.0C Harris Quidnish 14.5C, Redesdale 8.1C Mona 8.3C, Port Ellen, Islay 15.2 mm, Morecambe 15.4h Aberdaron 15.0h) [Max 26.4C Min 11.7C Rain nil]. Tweet about outbreak the hot weather ...Well you don't seem to be able to have hot weather in these parts without thunderstorms developing. On the morning of the 25th there were sferics recorded over the N channel at 07 GMT tracking north-east. Convergent breezes developed with cloud development at first over Morecambe Bay, the breeze settling into a SW'ly here. The temperature at 0900 GMT was a remarkable 26.4C (dewpoint 19.3C) RH 65% the maximum of the past 24-h. And it kept on rising reaching a record hot 31.3C at 1307 GMT. Towering cumulus clouds were seen and cumulonimbus developed and thunder was heard from 1706 GMT onwards. Sferics at 2128z on 25 June 2020. Courtesy of blitzortung.org/. Frequent TL observed with heavy rain showers with a rate of 46 mm/h at 1950 GMT and 5.0 mm of rain falling in an hour. Heavier rates up to 64 mm/h at 2240 GMT with brilliant lightning was seen from Llanfairfechan and Holyhead (Heathrow 33.4C Cardiff & Llansadwrn 31.3 Stornoway 14.7C, Loch Glascarnoch 6.2C, Port Ellen, Islay 20.6 mm Llansadwrn 8.8 mm Mona 0.6 mm, Wattisham 15.9h Valley 14.0h) [Max 31.3C Min 15.3C Rain 9.0 mm]. Thunder and lightning at 02 GMT on the 26th with heavy shower of rain. By morning there were signs of a break in the covering of cloud and there was a little weak sunshine, even a glimpse of clear sunshine. An overnight air minimum of 16.4C was highest of the month and highest since 2006 17.4C with the 17.6C in 2005 highest on record. Fine and warm with 19.7 at 0900 GMT. Pressure was on 1007 mb with a thundery low 1006 mb over Ireland, a cold front lay over the Celtic Sea and there were shower troughs over the western fringe and Thannet in the SE. Visibility was good with smoke haze moderate level 5. Tweet about 10 degrees less than yesterday ...A brief sunny spell in the evening then heavy rain up to 30 mm/h at 2330 GMT and thunder and lightning here at 2319 GMT and 2345 GMT (Kew Gardens 31.2C Hawarden 27.3C Aberdaron 14.9C, Braemar 7.4C, Castlederg 40.6 mm Whitechurch 22.4 mm, Reading University 14.1h Hawarden 5.9h Valley 0.5h) [Max 20.8C Min 16.4C Rain 9.8 mm]. There was more thunder and lightning locally after midnight on the 27th with heavy rain at 0220 GMT. The sky was overcast in the morning and it was spotting with rain at 0900 GMT. Cooler with 14.5C 93% RH, visibility was good the air pollution at a lower level 2 this morning. Pressure 998 mb was falling with complex low 994 mb off Malin Head, 993 mb at noon. Dull and breezy, blustery at times, a glimpse of sunshine then a shower of rain at 0930 GMT. Frequent showers throughout the day, unfit for work in the garden, there were 12 wet hours in the 24-h period (Kinloss 26.5C Hawarden 20.4C Capel Curig 14.6C, Redesdale 8.9C, Sennybridge 24.0 mm, Stornoway 8.5h Hawarden 2.6C Valley 0.9h) [Max 16.7C Min 13.0C Rain 5.2 mm].

The 28th dawned mostly cloudy and very windy. At 0900 GMT pressure 1003 mb was rising with slow-moving, but filling low 987 mb near N Scotland. Visibility was moderate with rain in sight. The weather was sunny in the SE, but again in the NW there were light to heavy showers. A mostly cloudy day, with rain and or drizzle almost throughout, heaviest at 1509 GMT 3.8 mm/h, and strong to gale-force SW'ly wind. Rain duration (wet hours) were 17 in the 24-h period. Coolest day with 13.6C since the 3rd 12.1C (Heathrow 22.0C Cardiff 17.6C Blencathra 10.8C, Okehampton 8.9C, Kielder Castle 48.0 mm Lake Vyrnwy 28.4 mm, Manston 11.9h Aberporth 6.1h Valley 0.8h) [Max 13.6C Min 11.2C Rain 14.2 mm]. The 29th was a very dull and sunless day, low hill fog on the Snowdonia Mountains where very wet. Cooler than of late and windy too the WSW'ly force 5 moderating through the day. A 0900 GMT there was just 65 W m -2 of solar radiation and this improved to only 269 W m -2 at 14 GMT some 25% of what could be expected this time of year. Pressure 1005 mb was rising with low 988 mb little changed still N of Scotland. An occlusion was sitting over N Wales and the cloud base was about 500 ft with drizzle at times here. Not much precipitation in daylight hours, light rain after midnight of duration 5 hours. Wet at Capel Curig (Heathrow 21.7C Cardiff 17.0C Lake Vyrnwy 10.7C, Dalwhinnie 8.4C, Capel Curig 34.6 mm, Manston 8.7h St Athan 1.6h Valley 0.0h) [Max 13.6C Min 10.5C Rain 1.8 mm]. The 30th and the last day of a strange June, the record setting weather events and COVID-19 pandemic issues, not that we have seen the end of either. Well, it had stopped raining at 0900 GMT after all night drizzle and rain. The sun was starting to break through the mostly cloudy sky. Cool, bright and wet, but not the end of 4-days of unseasonable weather. Pressure was not seeing much change with low 992 mb on the southern tip of Norway it was 1005 mb here. The day kept mostly cloudy with showery rain at times duration 9 hours. Pressure had fallen to 1002 mb at 1800 GMT when we had a short spell of heavy rain on a frontal system and quick fall in temperature of 3C from 16C (Weybourne 21.9C Hawarden 19.5C, Lake Vyrnwy 9.5C, Ballypatrick Forest 9.8 mm Bala 3.4 mm, Tiree 10.5h Bala 2.1h Valley 0.8h) [Max 15.9C Min 11.1C Rain 4.6 mm] .

The month ended with a rainfall total of 102.4 mm (144%) & [151%] of averages largest since 2017, one of the 19th wettest in Llansadwrn since 1928. The mean temperature was 14.7C (+0.5) & [+0.8] of averages highest since 2018 and the 12th warmest June in my records since 1979. The 31.3C on the 25th was the highest recorded in June at this station since records began in 1979 Despite 6 sunny days (>10h) it was a dull month overall, the 137.5 h sunshine at RAF Valley the 9th lowest on the Anglesey record back to 1931. There was an unusually high number of thunder events, but no hail .

 

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July 2020

July 1 - began in a dull and wet manner . At 0900 GMT with the sky overcast it was misty with drizzle imparting moderate visibility. The temperature was 14.0C with 95% RH, rising to 16.8C at noon. Pressure was 1003 mb in a trough of low-pressure N Wales and N England within a large area low 976 mb centred N Finland. It rained on and off most of the day (Weybourne 21.9C Hawarden 19.5C, Exeter 9.5C, Ballypatrick Forest 9.8 mm Bala 3.4 mm, Tiree 10.5h Bala 2.1h Valley 0.0h) [Max 16.8C Min 11.7C Rain 12.8 mm]. Red squirrel 'Peanuts' prefers shelled peanuts for birds to whole provided in the boxes.The 2nd dawned overcast and very dull solar radiation (SR) 211 W m -2 with drizzle there being a slow=moving occlusion over the Irish Sea and N Wales, but by 0900 GMT the sky looked a little brighter. Pressure 1010 mb was rising quickly the low 996 mb S Sweden with highs 1026 mb Azores and 1015 mb Greenland. Elsewhere showers some heavy with cumulonimbus reported in the south-east. The weather cleared up really slowly, sunny intervals SR 974 W m -2 at 1408 GMT then by the end of the afternoon the sky was clear. Red squirrels are seen frequently at the weather station an can de identified by their colour markings and behaviour, we provide nuts in boxes that most eat. This one we call peanuts prefers shelled peanuts provided for birds (Heathrow 22.5C sk 20.8C, Altnaharra 0.3C Tredegar 10.3C, Hull 29.6 mm Valley 9.8 mm, Tiree 9.1h Aberporth 6.7h Valley 6.5h) [Max 17.2 Min 12.1C Rain 8.7 mm]. Heavy rainfall in Wales on the 3 July 2020.Heavy rain, blustery wind and very poor visibility on the morning of the 3rd, the stratiform cloud looking grey to ground level towards the Snowdonia Mountains. Today it did not clear up and rained most of the time, thick cloud on a warm front, very dull at 0900 GMT SR 104 W m -2 rising to only 178 W m -2 at 1002 GMT. Did not go out again after the observations were completed, but there were some kite surf-boarders on the water at Rhosneiger. A sunless and very wet day [35.5 mm] falling here and [97.0 mm] falling in Capel Curig, the largest in Europe on this day. The wind moderated and the temperature rose through the day with the maximum 14.4C occurring at 2200 GMT (Heathrow 22.5C Cardiff 19.1C; Braemar 6.3C Lake Vyrnwy 9.1C, Capel Curig 83.6 mm, Manston 10.4h St Athan 0.4h) [Max 14.4C Min 11.2C Rain 35.5 mm]. There was thick fog after midnight on the 4th and little change by mornint, with moderate fog at 0900 GMT. Again very dull with a SR high of 257 W m at 0923 GMT. It did not get better, but the rain was not as heavy as yesterday, but it was wet still the same and sunless. Llyn Tegid at Bala had overflowed in parts, it was windy in southern Britain there was a gale warning for the Irish Sea, but less so in the north. Wind turbines were generating 27% of the UK electricity demand. Two cold fronts passed over later, at 18 GMT and 02 GMT, the SW'ly gusting to 39 mph at times (Charsfield 21.7C Hawarden 21.1C, Braemar 3.0C, Stonyhurst 29.8 mm Capel Curig 25.6 mm, Bala 4.2h Valley 0.0h) [Max 15.6 Min 12.9C Rain 2.7 mm]. A fine and breezy morning on the 5th with a few cumulus clouds and good, but hazy visibility. The gardeners' gale overnight had cause minimal damage as we have fragile plants well tied in just in case, and the herbaceous border is planted tight so that the plants support each other. It is looking great. Pressure 1008 mb was rising with the jetstream over Britain there was a low 983 mb over the North Sea. A cold front lay over SE England and the SW Approaches with high pressure as usual over the Azores 1031 mb. With Wales lockdown easing there were people back at the reopened carpark at Llyn Tegid, Bala, visitor centre. Mostly sunny, warm in the SE (Manston 24.4C Hawarden 17.9C, Loch Glascarnoch 8.0C, Eskdalemuir 32.8 mm Lake Vyrnwy 10.6 mm, Shoeburyness 12.3h Aberporth 11.7h Valley 7.8h) [Max 16.1C Min 12.0C Rain 0.3 mm].

Early light showers of rain on the 6th with a mostly cloudy sky in the morning. Pressure 1020 mb was rising quickly and the jetstream still over southern Britain, but here on the edge we had some sunshine in the afternoon with the highest solar radiation 1055 W m -2 as a transient ridge from Azores high 1033 mb developed. I have waited a while to get a photograph of one of the red-tailed bumblebees Bombus lapidarius we ave in the garden, today I succeeded Sunniest in the north (Pershore 22.3C Cardiff 30.3C, Braemar 7.5C, Myerscough 11.8 mm Capel Curig 1.4 mm, Glasgow 11.3h Aberporth 8.0h Valley 5.7h) [Max 18,1C Min 10.3C Rain 1.4 mm]. Red-tailed bumblebee on geranium nodosum in our Garden at Gadlys.AWS temperature and solar radiation record for the 7 July 2020.Low cloud on the 7th although visibility was good towards the Snowdonia Mountains. Dull and wet solar radiation at 0900 GMT just W m -2, temperature 11.9C. Pressure 1019 mb was falling, there was a train of lows driven by the jetstream over the Atlantic, responsible for the moist tropical air, one of which was the remains of ex-hurricane Edouard. Not to be confused with same named hurricane strongest of the season in 1996 that developed near Cape Verde, the storm formed near the coast of Africa in the middle of August. It moved westward then curved northward, and persisted for 8 days with winds up to 145 mph until early September when it became extratropical to the southeast of New England. It was a sunless day, very dull highest SR 292 W m -2 at 1050 GMT, with fog developing at 5 pm becoming thick (code 1). Hardly a summer temperature struggling to get to 13.8C in the evening at 2149 GMT with the low 1013 mb passing over North Wales at midnight. The temperature graph looked odd with the highest overnight the reverse of the normal rise associated with solar radiation received during daylight hours (Heathrow 22.6C Cardiff 17.6C, Wick Airport 5.4C Porthmadog 8.4C, Gogerddan 21.6 mm, Prestwick 8.6h St Athan 1.9h Valley nil) [Max 13.8C Min 10.6C Rain 1.4 mm]. Another dull and damp start to the day on the 8th with slight showers of rain under an overcast sky. Pressure was on 1014 mb with low 1012 mb central England that forecaster said was contained remnants of Edouard. The temperature at 0900 GMT 13.6C, a brighter spell about 11 GMT when there was a little weak sunshine as the cloud thinned a little, otherwise much of the same. The temperature rose to 15.8C at 1220 GMT, the afternoon turned wet with light rain and drizzle with a light to moderate spell in the evening (Heathrow 22.6C Cardiff 17.6C, Fair Isle 11.5C Lake Vyrnwy 12.6C, Wick 5.4C Porthmadog 8.4C, Gogerddan 21.6 mm; Prestwick 8.6h St Athan 1.9h Valley 0.6h) [Max 13.6C Min 10.6C Rain 7.7 mm]. Yet another very dull and damp day on the 9th with overcast uniform grey sky. Visibility was moderate with mist and there was a cool feeling NE'ly breeze. Mostly dry, some spots of drizzle at times, sunless here (Writtle 20.8C Usk 19.8C, Achnagart 2.9C Mona, Anglesey 12.3C, Emley Moor 33.0 mm Gogerddan 18.8 mm, Boulmer 11.3h Aberdaron 4.8h Valley 0.8h) [Max 13.8 Min 12.1 Rain 0.2 mm].

A fine bright morning on the 10th for a change, chilly overnight the air minimum 7.8C and 4.4C on the grass with moderate dew. It was already sunny in Penmon and eastward at Llandudno, and NW Anglesey at Rhosneiger at 0900 GMT. There was a NW breeze and this is always results in cloud over Llansadwrn (7 octas) the result of close proximity to the Carneddau Mountains. Pressure 1020 mb was rising with Azores high 1027 mb stretching as far as W Ireland. Later with scattered cumulus clouds we had frequent sunny spells in the afternoon (Shoreham 21.2C Cardiff 18.9C. Kinbrace 4.2C, Spadeadam 16.8 mm Whitechurch 1.4 mm, Bude 13.8h Aberdaron 13.4h Valley 10.0h) [Max 17.3C Min 7.8C Rain nil]. A tad more W in the breeze this 11th morning with a WSW'ly, but it did not make a lot of difference to the cloud cover with 7 octas. Visibility was very good and it was a lot warmer than expected 15.2C at 0900 GMT after a minimum of 7.9C and 3.8C on the grass. Pressure 1028 mb was rising within the high over the Celtic Sea. The NW fringe was mostly cloudy, but it was sunny in the S and E of the country. Clear and sunny at Rhosneiger and with easing of #lockdown cars were already lined up parked alongside the A5 at Tryfan. Some sunshine at times, if you were in the shade it felt chilly. Picked 3 lbs of blackcurrants (Gosport Fleetlands 23.1C Cardiff 21.0C, Benson 3.8C Sennybridge 4.0C, Loch Glascarnoch 4.0 mm Rhyl 0.2 mm, Aberdaron 14.6h Valley 12.4h) [Max 18.3C Min 7.9C Rain nil]. With a SSW'ly breeze cloud cover was 6 oktas on the 12th at 0900 GMT, visibility was excellent and clear. Quite sunny at times and especially in the afternoon and feeling warmer, but still a bit chilly if in the shade. Pressure was steady on 1028 mb UK high. Sowed a row of Oregon sugarpod peas, the third in succession to keep up the supply for the kitchen. Picked broadbeans for dinner. Kept dry through daylight hours (Heathrow 25.2C Usk 22.9C. Sennybridge 1.3C, Harris Quidnish 5.4 mm, Shoeburyness 14.9h St Athan 12.9h Valley 7.2h) [Max 19.3C Min 9.3C Rain 8.6 mm]

Rain after midnight on the 13th, light to moderate and heavy around 0630 GMT. Recent rain, overcast and very dull under thick cloud W m -2 at 0900 GMT, poor visibility with low fog on the slopes of the Snowdonia Mountains. The strong SW'ly wind was suiting the 10 wet-suited kite surfers out on the water at Rhosneiger, and they didn't mind the rain. Not suitable for gardeners, perhaps with wet suit, but not for me. There was a low 1005 mb between Iceland and Scotland with a cold front over the North Channel, we were in warm sector air. Despite the cloud and intermittent drizzle the amount of rainfall was only 0.2 mm. The day was sunless, but to the SE of here it was mostly sunny and hot in places (Shoeburyness 26.4C Cardiff 20.2C, Fair Isle 13.2C Sennybridge 15.0C, Goudhurst 6.5C, Scolton 17.0 mm, Shoeburyness 10.8h Lake Vyrnwy 0.5h) [Max 16.1C Min 13.6C Rain 0.2]. Dull again on the 14th beginning fine with good visibility and calm. The grass was very wet and a fairy ring was evident showing up in the moist conditions. The webcam view from Moelfre across Red Wharf Bay towards the mountains was a study in grey. A poor day for July, a shower in the afternoon and sunless here. Light rain from 1700 GMT with moderate fog developing in the evening (Heathrow 23.1C Cardiff 20.4C, Topcliffe 7.4C, Altnahinch 12.4 mm Mona 3.2 mm, Leuchars 7.9h St Athan 1.7h Valley 0.3h) [Max 15.3C Min 11.6C Rain 5.6 mm]. Much the same on the 15th showery rain in the small hours, grey clouds to ground level looking towards the mountains with mist and drizzle. Very wet everywhere, trees dripping with moisture. Light level low again 120 W at 0900 GMT the day sunless. Inside work today (Leuchars 21.0C Milford Haven 19.6C, Giants Causeway 13.2C, Houghton Hall 7.1C, Altnahinch 10.0 mm Trawsgoed 6.8 mm, Manston 6.5h Aberporth 0.9h Valley nil) [Max 14.9C Min 11.9C Rain 0.9 mm].

The first 15-days of the month have been wet and cool. Rainfall of 104 mm was more than the usual for the whole month with (119%) & [149%] of averages. The mean temperature well below normal 13.6C (-2.2) & [-2.1] of averages and the mean maximum 16.2C remarkably (-3.2) & [-3.3] of averages .

Continuing the unseasonable dull and wet weather the 16th began, well yes, overcast dull and misty with slight rain and drizzle. Cloud was just on the tops of the Snowdonia Mountains. Toadstools and moss in the weather station wood at Gadlys.Pressure 1022 mb was rising with Azores high 1030 mb extending a ridge towards southern Britain. Low 981 mb Iceland had a warm front over western North Sea so we were in the uncomfortable humid warm sector air the trees imitating a rain forest continuously dripping. Its why mosses grow well on the old stone walls and fallen tree trunks hereabouts. Fungi are very noticeable this year in the wood and elsewhere () [Max 19.8C Min 12.8C Rain 0.1 mm]. The 17th the same overcast sky and recent slight showers with more in sight at 0900 GMT. With slow-moving low 986 mb over E Iceland there was a cold front over the North Channel. Breezy the SSW'ly force 5 with the sun appearing weakly through thinning clouds at times. Drier later with bright spells, but not clearing up properly. Rain after midnight (Heathrow 28.5C Hawarden 24.0C Capel Curig 16.0C, Okehampton 9.0C, Killylane 14.6 mm Capel Curig 0.4 mm, Bournemouth 12.1h Hawarden 6.1h Valley 0.6h) [Max 19.3C Min 13.8C Rain 13.6 mm]. It was dull and very wet on the 18th with moderate rain in the morning. The rain was mainly in N England, Wales and S Ireland and this was helping to make this July one of the wettest in Llansadwrn on record. At 1400 GMT total rainfall had reached 123.7 mm [177%] of average. Low 990 mb was E Iceland and there was a cold front lying across the Irish Sea over the Isle of Man. This cleared southwards during the evening (Charlwood 26.4C Cardiff 19.7C, Aboyne 3.8C, Spadeadam 20.6 mm Gogerddan 18.8 mm, East Malling 12.9h Valley 2.8h) [Max 15.0C Min 14.0C Rain 7.0 mm). There was clear sky overnight and as a result cooler the air minimum 9.8C and falling to 5.7C on the grass with dew formed. On the morning of the 19th it was fine and sunny, with some development of convective cumuli over the mountaintops. There was a light NNE'ly breeze, boats were out on the water between Puffin and Conwy. Enjoying a splash at Aberffraw Bay.Large crowds were at Llyn Tegid, Bala, and in Snowdonia Penypass and A5 at Tryfan and Ogwen were busy people taking advantage of relaxing of COVID-19 restrictions and the better weather (Pershore 22.3C Usk 21.7C, Aberporth 15.5C, Katesbridge 1.4C, Holbeach 19.0 mm St Athan 10.2 mm, Morecambe 14.6h Aberdaron 14.0h Valley 13.1h) [Max 17.0C Min 9.8C Rain nil]. Great, another fine day on the 20th with pressure 1025 mb rising courtesy of Azores high 1028 mb stretching that little bit further to Ireland and Wales. Variable breezes an scattered cirrus and cumulus clouds, cool clean air drawn from the region of Iceland. Sunny spells becoming sunny by afternoon. Checked over the car in preparation for a site visit if the weather holds (Gosport 24.4C Usk 22.0C, Aberporth 15.8C, Sennybridge 2.3C, Achnagart 11.2 mm, Bude 14.9h Aberdaron 14.5h Valley 12.2h) [Max 18.5C Min 8.8C Grass 4.0C Rain nil].

View across Anglesey NE of Aberffraw #unlocked on 21 July 2020.

The 21st dawned fine, but disappointingly dull with the sky overcast with moderately high cloud just touching the tops of the Snowdonia Mountains; solar radiation was 153 W m -2 at 0900 GMT. Marsh helleborine orchids at Aberffraw dunes.Another cool night with the temperature on the grass dipping to 4.4C with moderate dew formation. Round-leaved wintergreen at Aberffraw dunes.Cloud persisted in Llansadwrn as usual, but it was pleasantly sunny at Aberffraw on the beach and brighter at Penmon Point and Llanfairfechan. Went on a site visit, the first since mid-February lockdown, to Tywyn Aberffraw too late to see many of the spring flowers and orchids, there was a late flush of marsh helleborines (photo left and below)on the big slack so that made the day and the trip out worthwhile. Also seen were round leaved wintergreen (photo right) and masses of wild thyme along with evidence that the dunes had been eco-grazed overwinter by the Murray Grey cattle (below right) (Gosport 24.7C Cardiff 22.1C, Sennybridge 2.2C, Wick 8.0 mm, St Athan 14.6h Valley 7.5h) [Max 18.8C Min 9.4C Rain nil].

The 22nd began bright and showery with signs of the sky clearing, but this was not to be. There was a blustery moderately strong SW'ly air from northern Arctic regions. Pressure 1022 mb was falling slowly with a minor low 1013 mb off the Hebrides. Marsh helleborine orchids at Aberffraw dunes.Azores high 1027 mb had an arm to S Britain, the Channel, NW France and Belgium 1027 mb. Southern Britain was mostly sunny while the W and NW had showery weather, N Scotland was better was Drizzle at times then rain in the afternoon here although Penmon and mainland coastal areas sunny, turning moderate to heavy in the evening (Heathrow 26.3C Cardiff 22.3C, Inverbrevie 12.1C Aberdaron 15.3C, Aboyne 3.9C Sennybridge 5.6C, Dunstaffnage 28.2 mm, Lerwick 15.0h St Athan 12.1h Valley 0.7h) [Max 18.2C Min 11.9C Rain 10.2 mm]. There was a lot of wild thyme flowering at Aberffraw dunes.A very poor day for outside activities on the 23rd beginning overcast with grey mist and rain to low level. Pressure 1014 mb was falling and the day continued in similar fashion. Best about it, well the rain would go someway towards restoring the water balance of the soil (Northolt 26.6C Whitechurch 21.1C, Ballypatrick Forest 14.0C Aberdaron 15.6C, Frittenden 8.6C, Dundrennan 40.4 mm Porthmadog 10.0 mm, Manston 9.4h Aberporth 3.0h Valley nil) [Max 16.2C Min 13.0C Rain 6.8 mm]. A better day than expected on the 24th after fog in the small hours had cleared beginning fine and bright with glimpses of sunshine. Visibility was very good and there was little wind so that the 15.8C felt pleasanter. Very wet underfoot so any work on soil in the garden was not a good idea until it dries. Rainfall this month so far had reached 152.9 mm. Further light to moderate rain from 1830 GMT with a heavy burst just before midnight (Kew Gardens 25.9C Hawarden 23.1C Gadlys Gardens 19.4C, Braemar 4.0C, Port Ellen 13.6 mm Porthmadog 7.4 mm, Lerwick 10.3h Valley 4.7h) [Max 19.4C Min 12.5C Rain 10.5 mm].

Early morning fog on the 25th was clearing away at 0900 GMT visibility then moderate. Very dull solar radiation just 132 W m -2 reaching 234 W m -2 just after noon, the temperature 14.5C with 96% RH felt muggy. Thunderstorms developed later in Devon and South Wales spreading to central England, the Welsh Borders and NE Scotland, giving us a miss (Coningsby 25.6C Hawarden 21.4C, Baltasound 10.6C, Craibstone 35.6 mm Capel Curig 24.6 mm, Leuchars 5.6h Hawarden 2.2h Valley 1.0h) [Max 15.9 Min 14.4C Rain 0.3 mm]. A fine, but breezy and again dull morning on the 26th with pressure 1008 mb rising things improved a little. There was a complex low NW Scotland this having associated occluded frontal cloud Western Isles, Ireland and here. It was brighter by 10 GMT with glimpses of sunshine continuing mostly cloudy, but dry through the day. Slight rain came along during the evening (Teddington 24.2C Hawarden 20.7C, Katesbridge 7.8C, Harris Quidnish 10.6 mm Tredegar 5.0 mm, Tiree 9.6h Aberdaron 5.5h Valley 2.7h) [Max 18.4C Min 11.7C Rain 17.8 mm]. Moderate to heavy rain after midnight on the 27th and a dull grey to ground morning with very poor visibility. It was sad to see the garden being battered by the S'ly force 6/7 'gardeners' gale' with rain making the plants heavy, but pleased to see many flowering plants on the herbaceous border, that the head gardener lovingly spends many hours tending, standing up to it well. I keep the tomatoes well tied in to stakes on the vegetable plot, guy ropes on the row of runner beans and potted chrysanthemums tied in although there was some damage to these. A few Bardsey and Gaerwen pigs' snout apples had been blown off, I picked them up but they are still too small to do much with. Pressure 996 mb was falling rapidly with low 994 mb Ireland with frontal triple-point near Bardsey Island at 06 GMT tracking to the Isle of Man 995 mb by 0900 GMT. Early thunderstorms developed in Somerset and S Wales tracked towards the Home Counties. Cloudy all day until the frontal system with well defined edge cleared slowly at noon to give a sunny fresh afternoon. Rainfall total up to 171.0 mm chasing the July record 182.1 mm recorded here in 2010 (Pershore 22.9C Hawarden 20.8C, Fyvie Castle 4.1C, Shap 35.8 mm Capel Curig 28.8 mm, Lerwick 6.2h Valley 5.1h) [Max 18.4C Min 11.7C Rain 4.2 mm]. A bright start on the 28th after a cool night 6.0C on the grass, convective cumuli were forming at 0900 GMT. Pressure 1014 mb was rising rapidly the low now 986 mb off Aberdeen gusting 48 mph at Wick. Pressure was high 1022 mb SE from Greenland and with a NW'ly breeze it was fresh with polar maritime air introduced having closed and open cell marine convection over the Atlantic to the north-west. There was a slight shower at 0915 GMT otherwise dry. Some sunshine at times, the Llansadwrn convergent cloud formed at noon persisting into the afternoon, occasionally sunny (Shoreham 23.0C Cardiff 19.2C, Killylane 7.9C Libanus 9.3C, Fair Isle 24.0 mm Rhyl 1.0 mm, Aberporth 11.3h Valley 9.6h) [Max 17.3C Min 10.7C Rain trace].

A fine bright morning on the 29th with some thinning moderately high altostratus. Very good clear visibility and feeling warmer Pressure was steady on 1020 mb with lows 995 mb S Norway and Iceland the latter having frontal cloud mass over SW Ireland where raining. High 1022 mb near Brittany had a ridge to Cardigan Bay and Anglesey. Frontal cloud and rain over central England, fine and sunny south coast, East Anglia and NE England and Scotland. Warmer air from the south was being introduced with rising temperatures here, this when meeting the cooler northern air could lead to instability later. (Heathrow 24.5C Usk 21.3C, Exeter 4.5C Usk 6.0C, Resallach 10.0 mm, East Malling 13.5h St Athan 7.7h Valley 3.7h) [Max 16.9C Min 10.8C Rain 2.2 mm]. Showery rain came along from midnight on the 30th amounting to 2.2 mm by morning. A fine morning with the sky clearing and very good visibility. Pressure steady on 1016 mb with low 990 mb S Iceland and a warm front over the N Irish Sea. Feeling warmer 16.4C at 0900 GMT in the plume of warm air from the south rising to a pleasant 22.8C at 3.30 pm in the afternoon (Heathrow 29.7C Hawarden 26.9C, Tulloch Bridge 2.0C, Dundrennan 17.4 mm Valley 4.2 mm, Wattisham 14.9h St Athan 13.6h) [Max 25.7C Min 13.2C Rain nil]. The overnight air minimum of 14.8C was highest of the month. It kept very fine, sunny and warm on the last day of July the 31st with a clear sky at 0900 GMT and remarkably for here a hot temperature of 25.7C 55% RH that by convention was credited to the 30th. The temperature rose to a maximum of 27.4C at 1141 GMT, highest of the month. Cloud encroached just after noon to give a mostly cloudy afternoon taking the edge off the temperature 21C at 1500 GMT. there was a shower of rian before midnight (Heathrow 37.8C Kew Gardens 37.3C third highest temp on record Hawarden 30.7C, Shobdon 8.3C Bala 10.1C, Ryhill (W Yorks) 10.8 mm, Weybourne 13.5h Hawarden 8.7h Valley 7.6h) [Max 27.4C Min 14.8C Rain 2.2 mm].

The month ended with a rainfall total of 179.6 mm (205%0 & [257%] of averages wettest since 2010 and 2nd wettest July on record in Llansadwrn since 1928; the mean temperature 14.6C (-1.3) & [-1.1] of averages was coolest since 2012 rank 7th in station records since 1979; there was a notable absence of thunder and hail; dullest since 2012 at Valley rank 17th on Anglesey record since 1931.


August 2020

August 1 - the last month of meteorological began on a pretty poor note with the sky overcast in contrast to the last days of July. It was raining and visibility was very poor as much of the NW of Britain. The SE was fine with sunny spells or clear sunshine. Pressure 1015 mb was rising and there was a little improvement by afternoon that had a sunny spell towards the end. The maximum today? Well 10C lower than yesterday (Heathrow 27.7C Usk 21.9C, Tulloch Bridge 14.5C Sennybridge 16.3C, Derrylin Cornahoule 8.9C, Altnahinch 14.8 mm Valley 6.8 mm, Waddington 10.9h St Athan 9.8h Valley 3.3h) [Max 17.7C Min 13.4C Rain 2.2 mm]. A fine and breezy morning on the mostly cloudy morning of the 2nd an back to normal with a cooler airflow and a recent shower of rain. Pressure 1017 mb was still rising slowly with low 990 mb Iceland and 997 mb Nova Scotia resulting in the W'ly flow. Pressure was high 1027 mb over the Azores. Various shower troughs were charted in the west and Ireland and we had a few through the day, otherwise sometimes bright (Heathrow 25.4C Usk 21.7C, South Newington 6.5C, Killylane 18.2 mm Mona 3.2 mm, Shoeburyness 10.2h Aberporth 10.1h Valley 4.9h) [Max 18.2C Min 12.1C Rain 1.2 mm]. A fresher feel on the 3rd after a cool night 7.3C on the grass, with very good visibility. Cloud was increasing and here were showers in the vicinity. Pressure was on 1018 mb with low 999 mb SE Iceland and low 989 mb S of Greenland over the Atlantic to the west. The temperature was 14.6C and there was a light WNW'ly breeze. A mostly cloudy, but dry day with infrequent sunny spells. Lifted my row of Angus potatoes, bought in for the kitchen that had sprouted planted during lockdown, quite pleased with the result there is nothing like boiled new potatoes to have with roast dinner (Gosport 24.2C Usk 20.4C, Eskdalemuir 3.1C Sennybridge 6.1C, Rhyl 11.8 mm, Yeovilton 13.0h St Athan 11.0h Valley 8.0h) [Max 17.8C Min 10.2C Grass 7.3C rain 1.2 mm]. A rather poor morning on the 4th with overcast sky looking grey to ground level in mist and slight rain. Low 990 mb was S of Iceland and there was a warm front over Ireland where at Bellmullet the wind was gusting 45 mph. A sunless day the blustery wind strengthening to 35 mph and turning very wet late afternoon and evening, The AWS raingauge malfunctioned due to the petiole of a leaf entering the funnel outlet and preventing tipping, not had that one before. On inspection next day there was also a slug found inside the housing, had that before when slime ruined the sensor that had to be replaced, but no problem on this occasion. The official copper gauge is always manually read at 0900 GMT which caught 23.5 mm (Heathrow 24.9C Usk 21.0C, Aboyne 3.4C Usk 5.3C, Tyndrum 71.0 mm Sennybridge 4.8 mm, Manston 13.4h Hawarden 1,4h Valley nil) [Capel Curig 53.8 mm Mona 10.4 mm Valley 6.2 mm Hawarden 1.0 mm] [Max 16.7C Min 11.1C Grass 7.5C Rain 23.5 mm]. The 5th continued the autumnal theme with masses of browned leaves dropping from the beech trees, at times looking like snow, almost covering the ground in laces aided by a blustery force 5 SW'ly. Visibility was poor with mist and slight rain and drizzle. There was minor damage all over the garden with some potted plants blown over and broken chrysanthemum stems despite the tying up done. Low 978 mb Iceland had a triple-point frontal wave SW Ireland and a warm front straddled the Irish Sea. So warm, 16.4C at 0900 GMT rising to 18.7C just after noon, and moist although the total precipitation collected over the 24h was only 0.6 mm (Santon Downham 28.4C Cardiff 22.7C, Frittenden 11.6C Tredegar 14.3C, Capel Curig 55.4 mm, Shoeburyness 12.5h St Athan 2.7h) Capel Curig 16.4 mm Lake Vyrnwy 10.4 mm ] [Max 18.7C Min 13.9C Grass 12.0 Rain 0.6 mm].

After midnight on the 6th deep radiation fog fog developed under clear sky. By morning it was still misty with visibility moderate and cloud forming. At 0900 GMT the temperature was 17.7C (dewpoint 16.9C) 95% RH. The grass was very wet with dew and fog deposition. Pressure was on 1015 mb in a generally slack area around Britain, a low was developing W of Ireland 991 mb and the old frontal system was over the Channel and N Sea. Best of the weather where sunny was N Scotland and N northern England. Here mostly cloudy, but North Wales tourist spots in the mountains and beaches on Anglesey were busy (Wisley 30.1C Hawarden 24.5C, Altnaharra 6.0C Mona 10.7C, Plymouth 3.8 mm Sennybridge 1.6 mm, Kinloss 13.9h Aberdaron 2.8h Valley 2.1h) [Max 19.7C Min 13.2C Grass 9.0C Rain 0.6 mm]. There was some rain after midnight on the 7th and still cloudy at dawn, but the sky was clearing slowly at 0900 GMT with cloud lifting from the Snowdonia mountaintops in very good visibility. Pressure 1017 mb was rising with a low 990 mb Iceland and cloud associated with a cold front over Ireland encroaching the north-west. Feeling warm, sunny spells in the afternoon and a sunny evening. Hot at Gorwel Heights, Llanfairfechan 25.3C and the south (Heathrow 36.4C Usk 29.0C, Harris Quidnish 15.7C Aberdaron 17.1C, Exeter 10.4C, Magilligan 14.2 mm, Wattisham 12.1h St Athan 9.9h Valley 5.7h) [Max 22.3C Min 15.8C Rain nil]. A very fine morning on the 8th with just a little contra with cirrostratus far to the SSW, clear very good visibility. Pressure was on 1024 mb and there was a light NE'ly breeze. The fine weather again attracted many people to the beaches with the A55 on to the island at a standstill at times; car parks soon filled up including Llyn Tegid, Penypass and Ogwen. Sunny, but cool in the north hot again in the south (Herstmonceux 34.5C Usk 30.1C, Drumnadrochit 4.3C Mona 12.0C, Lerwick 2.0 mm Aberporth 0.8 mm, Edinburgh 14.3h Valley 13.6h) [Max 22.0C Min 14.2C Rain nil]. A fine and sunny, but breezy morning on the 9th with many leaves falling like snow from the tall trees giving an autumnal look. Beech in particular lost that vivid green colour some while ago, now pale and some quite brown. The soil surface was drying in the wind, but not 100% dry. Pressure was on 1020 mb and it was a warm 18.3C at 0900 GMT. Central England began cloudy and misty, the N Scotland, SE England and Anglesey were sunny. Hot in the south (Herstmonceux 34.0C Hawarden 24.3C, Aboyne 1.5C, Bridlington 0.6 mm, Kirkwall 14.2h Valley 12.8h) [Max 22.0C Min 14.2C Rain nil].

The 10th began fair, but mostly cloudy with poor visibility. There was a thundery low 1011 mb over the Charente Maritime, France and a trough over Cornwall and NE England. The MetO had issued a yellow warning for thunderstorms, sferics were observed early in the Severn estuary and the NE coast of England. Storms soon spread over Cornwall, S Wales and Aberystwyth where there was flash flooding. Large thunderstorm over the Carneddau and Llanfairfechan with torrential rain at 1450 GMT at Gorwel Heights, 19.2 mm fell in 20 minutes with 24.4 mm in total during the 1 hour event from 1440-1540 GMT and a 24-h total of (26.2 mm). The Aber road out Llanfairfechan was flash flooded and some road surfaces damaged. Gorddinog AWS reported no rain in that hour, but had less intense rain earlier and later with a total of (17.2 mm). Llansadwrn had no rain in the specified hour, but had 1.4 mm from 1450-1510 GMT and a total of (2.0 mm) in the 24-h (00-00 GMT). Heavy thunder was heard in Llansadwrn and frequent lightning seen during the event. A spectacular lightning strike on the Menai Strait near the Anglesey shore was photographed by Rhian Toghill from Caernarfon (Heathrow 35.5C Usk 25.8C, Altnaharra 3.1C, Chivenor 27.8 mm Whitechurch 19.2 mm, Weybourne 13.3h Hawarden 3.9h) [Max 20.7C Min 15.1C Rain 1.8 mm]. Fog developed after midnight on the 11th and with very little wind visibility was still very poor by morning. Pressure 1016 mb in a slack thundery low pressure system. There was fog on the bridges, signs of the fog/ cloud thinning with some weak sunshine developing. Feeling warm the temperature 18.4C with 96% RH. Fog persisted around the coast for a while before the temperature rose to 25.5C at 1429 GMT. Sultry into the evening. Thunder was heard at 2207 GMT and 2218 GMT with lightning in the clouds (Heathrow 35.7C Usk 30.8C Aberporth 17.9C, Kinbrace 5.9C, Morecambe 51.6 mm Lake Vyrnwy 39.6 mm, Bournemouth 12.3h Hawarden 10.9h) [Max 25.5C Min 15.3C Rain nil]. A bright start on the 12th, after an overnight minimum of 15.3C a sunny and warm morning the temperature at 0900 GMT 20.6C and somewhat humid at 92% RH. Tweet about the heavy thunder over the Carneddau Mountains...Visibility was poor in smoke haze level 5 at Marchlyn Mawr with some Saharan dust in the air. A crowd of people in the water at Rhosneigr Bay and visiting other spots in N Wales including Llyn Tegid, Penypass and Ogwen. Thundery lows in Biscay and the Charente Maritime moved north. Continuous heavy thunder was heard to the SE over the Carneddau Mountains from 1425 GMT for about 20 minutes, reminiscent of storms in the South of France. Further thunder and lightning 1500 GMT as the storm moved westward. Before midnight there were sferics recorded all around with flashes in the sky, but no thunder was heard. Hot in the S very wet in Scotland (Heathrow 35.4C Usk 33.5C, Giants Causeway 13.8C Aberporth 21.0C, Magilligan 10.7C, Inverbervie 54.6 mm Llysdinam 18.8 mm, Bournemouth 13.0h St Athan 11.3h Valley 10.0h) [Hereford 48.4 mm Shawbury 33.6 mm Bala 22.2 mm] Rhyl 9.4 mm Capel Curig 8.8 mm] [Max 24.9C Min 15.3C Rain 0.1 mm].

The 13th began very fine, sunny and warm, at 0900 GMT the temperature was 23.7C with 81% RH. There was thick haze, but visibility was good. The cereal field adjacent to the weather station was sprayed at 1024 GMT. The sky cleared and the afternoon was warm. Sferics were recorded near the tip of Llyn about 20 GMT. Flash flooding due to storms occurred in the Home Counties and M25 (Porthmadog 29.8C, Harris Quidnish 11.2C, Newport (Salop) 38.8 mm Aberdaron 21.4 mm, Morecambe 12.7h Valley 10.4h) [Max 24.8C Min 18.3C Rain 1.6 mm]. After a short heavy shower of rain a 0217 GMT it was another fine and warm morning on the 14th, but with thick haze the visibility was very poor and ozone was moderately high on level 5 at Marchlyn Mawr. Pressure was on 1015 mb with thundery lows 1011 mb NE entrance to the Dover Strait and Atlantic to the south. A warm sunny afternoon (Coton-in-the-Elms 26.5C Porthmadog 25.4C, Lerwick 9.7C/ 13.0C, Cavendish 49.2 mm Tredegar 12.4 mm, Morecambe 12.4h Aberdaron 7.7h) [Max 22.3C Min 16.6C rain nil]. The best of today's weather on the 15th was on Anglesey and NW Wales, beginning with a few lenticular altocumulus clouds. A fresher feel with less humidity 19.7C (dewpoint 16.2C) RH 80% made for a pleasant morning, an autumnal look with many leaves on the grass mainly browned beech. Warm and sunny into the early evening (Porthmadog 25.3C, Stornoway 6.3C Bala 11.0C, Writtle 53.6 mm Mumbles Head 18.2 mm, Valley 12.1h) [Max 23.8C Min 15.3C Rain 2.8 mm]. The 15th began very fine and sunny, but fresher with a temperature of 19.7C. _Pressure was on 1015 mb with a thundery low NW of Cap Finisterre, a cold front was lying over the Celtic Sea and English Channel. Pressure was high 1020 mb over the North Sea and the best of the weather today temperatures and sunshine were here in North Wales it being misty with rain in southern Britain. It was looking a bit autumnal though as the lawns were covered with fallen brown tree leaves, mainly beech. there were storms along the western coastline of France during the day (Porthmadog 25.3C Stornoway 6.3C Writtle 53.6 mm Mumbles Head 18.2 mm Valley 12.1h) [Max 23.8 Min 15.3C Rain 2.8 mm].

The first 15-days of the month have been dry and warm. Rainfall of 35.8 mm (39%) & [41%] of averages, the large fall 23.5 mm on the 4th accounting for most . The mean temperature was above normal 17.6C (+2.4) & [+2.0] of averages. Sunny with a mean of 6.2 hours a day.

A cooler dull day on the 16th with overcast skies and thick haze, sunless. Showery rain developed just before midnight (Cavendish 25.9C Trawsgoed 22.9C, Kinbrace 5.0C, Cranwell 42.0 mm Sennybridge 24.2 mm, Altnaharra 11.2h Aberporth 1.6h) [Max 17.9C Min 15.3C Rain 3.2 mm]. Another very poor day on the 17th very dull under a sheet of thick cloud and it was raining. Moderate to heavy rain through the morning, very dull at 1300 GMT only 25W m -2 . A lull late in the afternoon, but sunless, then more heavy rain in the evening. Heavy downpours and thunderstorms hit parts of South Wales during the afternoon and brought flash flooding to a number of homes across parts of mid Wales. Ystradgynlais and Abercraf in Powys were the worst affected areas (Heathrow 25.1C Cardiff 22.8C, Aboyne 8.0C, Wellesbourne 49.0 mm Aberporth 46.2 mm, Manston 8.1h St Athan 6.0h) [Max 17.3C Min 15.3C Rain 29.2 mm]. The 18th began overcast and dull after a recent shower, but it looked brighter in the S although cumulus clouds were developing over the mountains. Rainfall measured at 0900 GMT was 29.2 mm over the past 24h, the largest daily fall of the month. Some sunny spells in the afternoon (Manston 25.6C Usk 24.1C, Bainbridge 9.9C, Porthmadog 25.4 mm, Shoeburyness 11.8h Valley 7.6h) [Max 20.7C Min 14.7C Rain trace]. Another dull and sunless day on the 19th, pressure 1001 mb was falling the result of Storm Ellen named by Met Éirann, remnants of tropical storm Kyle, with low 993 mb over the Celtic Sea. It was raining in SW England and Wales, we had a heavy squall at 1100 GMT the rain beating against the windows. Pressure fell to 989.4 mb at 22:49 GMT, a cold front passed over with a burst of heavy rain 37 mm/h at 2330 GMT, but was 968 mb over Ireland (Achnagart 24.7C Gogerddan 24.1C, Braemar 6.6C, Hurn 35.8 mm Tredegar 29.8 mm, Stornoway 10.0h St Athan 0.9h Valley nil) [Max 20.4C Min 13.6C Rain 3.5 mm]. It was very windy after midnight, gale force 8 was recorded at Valley with 51 mph gusts. The wind very noisy in the trees in the morning of the 20th so I put on the hard hat for the obs at 0900 GMT. Pressure 997 mb was rising very quickly with Storm Ellen 969 mb W of Ireland. The wind continued roaring through the morning, but there were some sunny spells. The sea was very rough around the coast of Anglesey on the high tide, a gust of 67 mph was recorded at Malin Head and 50 mph at Cork, Ireland, where a rare red warning had been issued (Weybourne 27.3C Hawarden 22.6C, Westonbirt 10.8, Thomastown 30.6 mm Capel Curig 6.6 mm, Waddington 12.8h Hawarden 6.5h Valley 5.9h) [Max 21.1 Min 15.2C Rain 12.0 mm].

The 21st continued with the unseasonable August weather. Strong to gale force SSW'ly wind through the morning. Valley reported gale to severe gale from 09 to 14 GMT with a highest gust of 62 mph at 1150 GMT, while a gust of 61 mph was reported at Mumbles Head, and 47 mph at Mona . Pressure was on 989 mb as a depression 965 mb at Shannon, Ireland, slow-moving. A very rough day with showers of rain (Weybourne 24.8C St Athan 20.5C, Aberporth 11.1C, Bala 38.2 mm, Weybourne 9.3h Aberdaron 6.3h Valley 6.2h) [Max 18.6C Min 12.2C Rain 2.4 mm]. The wind was down a notch on the 22nd, but it was still very blustery. It was showery at 0900 GMT, overcast with moderate visibility. Pressure was on 1006 mb and rising the depression 995 mb filling over Shannon and little moved. Elite in the way of sunshine (Heathrow 24.4C Cardiff 19.8C, Aboyne 10.4C, Stonyhurst 43.6 mm Bala 26.0 mm, Wattisham 9.6h Aberdaron 4.4h) [Max 17.4C Min 14.2C Rain 5.2 mm]. The 23rd began unpromisingly with low overcast clod, mist and moderate to heavy rain turning to slight rain and drizzle by 0900 GMT. Fairly breezy the SW'ly force 3/4, The rain stopped and there were some glimpses of sunshine through the afternoon (Heathrow 23.6C Hawarden 19.0C, Drumnadrochit 7.6C, Carlisle 28.0 mm St Athan 6.4 mm, East Malling 5.9h Aberporth 4.6h Valley 1.0h) [Max 17.2C Min 12.1C Rain 0.7 mm]. It was a quite night with little, or no wind and a brighter day on the 24th with very good clear visibility. There was a chill in the air, at least so it seemed, but it was nice in the sun which we saw a little more of today. Pressure was steady on 1016 mb, but another storm Francis was gathering over the Atlantic (Manston 24.1C Usk 21.6C, Loch Glascarnoch -0.4C Mona 7.0C, St Catherine's Point 31.4 mm Milford haven 5.2 mm, Morecambe 12.6h Valley 8.1h) [Max 18.8C Min 10.1C Rain 13.8 mm]. A band of moderate rain swept through overnight on a plume of moist tropical air. On the morning of the 25th it was fine though mostly cloudy and warm in the tropical air, 16.6C and 94% RH. Pressure 987 mb was falling quickly, very windy again the result of Storm Francis, the MetO had issued an amber warning for wind, a good day for wind power generation which was carrying 43% of the UK demand. The area of rain had moved over S Scotland and Northern Ireland. A little brightness then moderate rain began at 1130 GMT becoming heavy around 14 GMT then lessening becoming light through the afternoon into the evening and petering out before midnight. Over 12h there had been 39.0 mm of rain, largest of the month, The A5 between Bethesda and Capel Curig was closed due to a large landslide and the A55 at Abergwyngregin was flooded due to flash flood of the River Ogwen. Properties were flooded and water entered the cellars of nearby newly established whisky distillery reopened after #lockdown. Thousands of properties lost their power there was widespread travel disruption. Falling trees have damaged homes and vehicles, and blocked roads across Wales. There were over 80 evacuations of people from their homes overnight and there was widespread travel disruption after Wales was hit by Storm Francis. Several lakes over flowed their banks including Llyn Tegid, Bala, and several river levels were at their highest on record. Bethesda in the Ogwen valley saw the highest rainfall in the UK, according to the Met Office, with 104 mm About 40 people in Bethesda were rescued from chalets and homes and taken to the local leisure centre. About five Beddgelert householders were also rescued by boat, the fire and rescue service said (Source: BBC Wales) (Heathrow 22.4C Hawarden 20.3C, Altnaharra 4.1C, Bethesda 104 mm Lake Vyrnwy 68.4 mm Gorwel Heights 44.2 mm, Lerwick 10.0h Aberporth 2.8h Valley nil) [Max 16.8V Min 13.0C Rain 39.0 mm]

On the 26th it was a fine bright morning and feeling warmish in the light WSW'ly breeze. There seemed little or no damage caused by Storm Francis here, the car park at Llyn Tegid, Bala, was flooded again by the overflowing lake. The strongest winds were now over East Anglia and Thanet. Pressure 1013 mb was rising quickly the depression now 989 mb E North Sea near Denmark. An occluded front was over the North Channel while there was a ridge of high-pressure to the west from Atlantic-high 1921 mb off Iberia. The weather improved in the afternoon, cumuli developed over the mountains, with sunshine in common with Irish Sea coastal areas and Morecambe Bay (Heathrow 23.6C Cardiff 20.4C, Kinbrace 7.2C, Leek 19.6 mm Rhyl 9.6 mm, Camborne 11.0h Aberdaron 8.4h) [Max 19.4C Min 13.9C Rain 0.8 mm]. The 27th was again a very disappointing day, you would think after all the storms and rain that August would produce something better, but it does have a reputation for awful days. Pressure 1011 mb was falling quickly with deepening low 1005 mb over SW Ireland and the Celtic Sea. Overcast, cloud low on the mountains, dull just 83W m at 0900 GMT almost dark, after recent rain any brightness had disappeared the cloud thickening. An area of rain covered the SW and western fringes from Scotland to Cornwall. Wet and sunless, stayed indoors all day (Manston 21.7C Whitechurch 18.3C, low max Lake Vyrnwy 11.5C, Kinlochewe 4.6C, Camborne 36.8 mm Cardiff 31.4 mm, Kirkwall 4.2h St Athan 1.9h Valley nil) [Max 14.7C Min 12.9C Rain 22.0 mm]. Much the same on he 28th gre skies, dull and breezy. Pressure 1003 mb was rising with lows 999 mb central England and 996 mb Denmark. A heavy shower at 0744 GMT then some recent glimpses of sunshine the a shower at 0900 GMT and slight rain developing during the morning. In the afternoon becoming dry with broken cloud cover and sunny intervals (Frittenden 21.0C Cardiff 20.1C, Kinbrace 5.0C, Scarborough 49.0 mm St Athan 32.6 mm, Tiree 9.9h St Athan 34h Valley 1.4h) [Max 16.3C Min 11.4C Rain 0.7 mm].

With a chance of August redeeming itself with pressure 1014 mb still rising the 29th began fine and bright in a NNE'ly breeze. A cooler feel this morning after an overnight minimum of 9.8C. A shower trough was over Wales and we had a few spots of rain at times. Cumulus clouds over the mountaintops were developing, but the afternoon kept dry with some sunshine at times (Gosport 18.9C Cardiff 18.5C, Swyddffynnon 3.4C, Tibenham 17.2 mm Capel Curig 2.2 mm, St Athan 9.8h) [Max 15.4C Min 10.6C Rain 0.2 mm]. With the sky clearing overnight the early hours of the 30th were cool with an air minimum of 8.4C at 0538 GMT falling to 3.8C on the grass. With high pressure 1023 mb at Shannon pressure here was 1021 mb and rising. Atlantic-frontal cloud to the west was being kept at bay or the moment by the high pressure. It was nice to see a blue sky and have very good visibility. A very fine dry day, but cloud did develop so it wasn't as sunny as it might have been in the afternoon. The bird scaring cannons were firing in fields nearby today, I have heard geese about (Plymouth 19.5C Porthmadog 18.6C, Katesbridge -0.1C Sennybridge 1.4C, Monks Wood 4.6 mm Scolton 0.6 mm, Bude 11.8h Aberporth 11.6h Valley 2.7h) [Max 15.7C Min 4.4C Grass 3.8C Rain nil]. The 31st was a fine sunny day with hardly a cloud in the sky. Cool ,again overnight air minimum 6.9C 1.2C lower than average and 2.5C on the grass this 1.8C lower than average. Lines of convective cumuli formed over the mountaintops of Snowdonia by 0930 GMT. Pressure was steady on 1022 mb with a high 1023 mb over N England. Pressure was low 986 mb SE Greenland and 993 mb Svarlbard. It was sunny in SW England, Wales and NE England. Another dry day (Cardiff 19.9C Llansadwrn 18.4C, Altnaharra 0.2C Capel Curig 1.6C, Market Bosworth 0.6 mm, Lerwick 13.1h Valley 12.4h) [Max 18.4C Min 6.9C Rain nil].

August ended with a rainfall total of 168.5 mm (183%) & [194%] of averages wettest since since 1961 and 4th wettest August on record since 1928. With a mean temperature of 16.4C it was the warmest since 2004 ranking 8th in station records since 1979. It was dullest since 2018 at Valley ranking 40th on Anglesey record since 1931.


September 2020

September 1 - there was a clear bright moon shining overnight and it was calm. In the morning there was a light S'ly breeze and very little cloud although cumuli were starting to build over the Snowdonia Mountains. Very good and clear visibility. With no rain and some dew the bare plot was 60% dry and the grass wet the minimum m thermometer showing 4.9C. Pressure was on 1021 mb with Azores high 1024 mb. Low 990 mb was over Iceland and there was an occluded frontal wave over Ireland. The sky was cloudier around noon for a while with convective clouds formed, but these diminished allowing sunny spells in the afternoon (Kinlochewe 21.6C Whitechurch 20.8C, Braemar 0.2C Sennybridge 1.8C, South Uist 10.2 mm, Morecambe 12.5h St Athan 11.9h) [Max 18.7C Min 8.3C Grass 4.9C Rain 1.2 mm]. Well it was another very poor day on the 2nd beginning overcast with a moderate to strong S'ly breeze. Early showers turned to moderate rain by 0900 GMT. It was very dull with poor visibility. Pressure 1015 mb was falling with complex low 986 mb W of Scotland. A frontal cloud mass was over Scotland, Ireland and Wales. The weather did not improve, remaining sunless. Gorddinog and Gorwel Heights saw Föhn-enhanced temperatures of 20.8C at 1620 GMT and 20.6C at 2120 GMT respectively. Heavy rain just before midnight 27 mm/h. Rainfall of 15.2 mm in the 24h beginning 09 GMT today was second largest of the month (Cambridge Niab 21.7C St Athan 18.8C, Santon Downham 3.6C, Dundrennan 49.4 mm Valley 16.6 mm, Shoeburyness 8.1h Hawarden 1.2h Valley nil) [Max 16.9C Min 12.8C Rain 15.2 mm]. A blustery mostly cloudy morning on the 3rd spots of rain ceasing just after 0900 GMT. A trace of Saharan dust was collected, the Atlantic route via the Caribbean to reach here. Pressure 1012 mb was rising the cold front that recently passed, associated with complex low 980 mb Iceland, now lying to the SE. A little sunshine in the afternoon (Manston 23.2C Hawarden 20.6C, Aboyne 7.4C, Sennybridge 21.4 mm, Kinloss 9.3h Aberdaron 8.2h Valley 3.2h) [Max 17.8C Min 13.4C Rain trace]. After broken sky overnight a mostly cloudy, but bright morning on the 4th feeling fresher in the moderate SW'ly breeze. Another trace of Saharan dust detected. Pressure 1020 mb was rising with low 987 mb North Sea. A detached occlusion was over Malin and N Scotland. Yesterdays cold front was today lying over N France. Southern UK was generally sunny with few showers. Most rain was over N Ireland and W Scotland. Warm again in Thanet and sunny NE Scotland. We had a short heavy shower of rain that fell at a rate up to 83 mm/h at 1827 GMT (Manston 22.0C Cardiff 18.8C, Eskdalemuir 7.8C, Achnagart 29.0 mm Capel Curig 2.0 mm, Leuchars 9.5h Valley 3.5h) [Max 15.8C Min 10.6C Grass 5.6C Rain 2.7 mm].

On the 5th the jetstream was re-established across the Atlantic above the Great Lakes, Canada, and via Nova Scotia and S Greenland to the Irish Sea. Pressure here 1022 mb was rising in a ridge to Brittany from Azores high 1038 mb, with low 991 mb over the Norwegian Sea we were in a westerly airflow. A fine morning after recent showers, convective clouds were building and visibility was moderate to good, there were more light to moderate showers later in the morning. The afternoon was dry with variable wind and cloud amounts and sunny intervals. The best weather was in south (Frittenden 20.8C Usk 18.9C, Exeter 5.4C, Keswick 11.6 mm Lake Vyrnwy 3.6 mm, Bournemouth 10.6h Aberporth 6.9h Valley 4.8h) [Max 16.1C Min 9.6C Rain 1.1 mm]. The 6th dawned dull and misty with light rain, but became brighter and showery by 0900 GMT. Pressure was on 1020 mb in a ridge from Azores high 1034 mb with an occlusion over the Celtic Sea and Cardigan Bay associated with complex low 990 mb Greenland/ Iceland region. There were some further light showers during the day, and sunshine here was at a premium. Best in the SE and N Scotland (Cavendish 20.8C Cardiff 20.6C, Kinbrace 0.8C, Blencathra 12.6 mm Swyddffynnon 6.4 mm, Shoeburyness 8.0h Aberdaron 7.1h) [Max 18.5C Min 9.8C Rain 0.9 mm]. A dull and damp day on the 7th, overcast skies with slight rain and drizzle. Sunless (Heathrow 21.9C Hawarden 18.7C, Sennybridge 5.9C, Tiree 31.8 mm Scolton 5.2 mm, Bournemouth 6.7h Bala 0.1h) [Max 16.8C Min 11.4C Rain 1.8 mm]. Another mostly dull day on the 8th beginning with the sky overcast then brightening with glimpses of sunshine. Pressure 1023 mb was rising, but low 974 mb Norwegian Sea had an associated mass of cloud over the N Irish Sea. The air minimum overnight 13.6C joint second highest of the month. Feeling warm at 0900 GMT 16.8C highest of the past 24-h, going on to reach a pleasant 20.4C in the afternoon. At Gorwel Heights the temperature rose to 24.7C, highest of the month, and 24.8C at Gorddinog AWS. Weeded the 'bare' Met plot that should have minimal maintenance, it's used for the soil thermometers at 4 and 10 cm depth, and observation of 'state of ground' at 0900 GMT (Cavendish 26.1C Hawarden 25.0C, Min Tain Range 9.8C Gorwel Heights 14.6C Tredegar/ Llansadwrn 13.6C, Achnagart 23.0 mm Porthmadog 7.8 mm, Camborne 9.2h Hawarden 6.6h) [Max 20.4C Min 13.6C Rain 4.9 mm]

A fine and sunny morning on the 9th and the 13.4C feeling fresh after passage of a cold front that cleared here earlier and was now lying over S Snowdonia. Pressure 1025 mb was rising quickly with high 1033 mb over the Atlantic to the SW. Marine closed cell convection was packed over the Atlantic to the W and NW. Cumulus clouds developed close to the mountains, the afternoon kept dry with sunny spells and sunnier in the west of the island, before a slight shower came along about 19 GMT in the evening (Frittenden 25.0C Cardiff 22.6C, Katesbridge 5.8C, Kirkwall 12.0 mm Rhyl 8.2 mm, Leeming 10.4h Hawarden 8.6h Valley 8.0h ) [Max 17.7C Min 11.1C Rain 0.1 mm]. Pressure was steady on 1025 mb on the 10th and there was a period of calm in the night and early morning. |A ridge of high-pressure covered the UK from Atlantic-high 1029 mb N of the Azores. The sky was mostly cloudy, in common with the western fringe, covered with altostratus and visibility was good with a slight haze. Sunny just after noon then a sunny spells to end the dry day (Herstmonceux 21.4C Milford Haven 18.8C, Aboyne 0.3C Sennybridge 3.1C, Wattisham 10.4h St Athan 6.5h Valley 1.1h) [Max 13.1C Min 10.8C Rain nil]. The 11th began on a dull, but dry and quite windy note. Overcast at first the cloud breaking up a little after 0900 GMT when cumulus clouds were developing over the Snowdoina Mountains where showers were seen. Pressure was steady on 1013 mb with low 976 mb Iceland and an associated cold front lying western Ireland and Western Isles. The crop of barley and oats in the field adjacent to the weather station was combined today and the job finished before it rained on a cold front passing in the evening (Frittenden 20.7C Trawsgoed 18.3C, Santon Downham 3.6C, Achnagart 51.6 mm Lake Vyrnwy 4.4 mm, Shoeburyness 8.2h Aberdaron 2.6h Valley 1.1h) [Max 16.3C Min 11.6C Rain 3.2 mm]. A bright and fresh morning on the 12th with some cumulus and cirrus clouds, visibility was only moderate in haze. The grass was wet after overnight rain, but was drying in the force 3 SW'ly breeze. Pressure 1017 mb was rising with low N North Sea with yesterday evening's cold front over S England, Cornwall to East Anglia. There were sunny spells in the afternoon with the breeze moderating (Heathrow 22.7C Usk 20.1C, Drumnadrochit 5.5C, Achnagart 37.4 mm Hawarden 3.6 mm, Waddington 10.9h Aberdaron 10.3h Valley 7.8h) [Max 16.6C Min 10.9C Rain nil].

¤

It was back to windy weather on the 13th seemingly blowing half a gale, well force 6 by the way the tall trees were responding. Pressure was rising with strong SW'ly airflow off the Atlantic as a frontal-wave 1000 mb lay off Malin and W Scotland. Dull and blustery through the day with a few glimpses of sunshine in the afternoon. The maximum temperature here was 18.1C, but in Llanfairfechan the Föhn-like wind resulted in 22.5C at Gorwel Heights and 23.1C at Gorddinog AWS at 1429 GMT. Very wet in the Highlands of Scotland (Kew Gardens 25.9C Hawarden 22.8C, Exeter 6.5C, Achnagart 120.2 mm Capel Curig 3.0 mm, Shoeburyness 11.8h St Athan 9.2h Valley 0.2h) [Max 18.1C Min 13.6C Pptn trace]. There was thick fog at 0530 GMT on the 14th, but this soon cleared away to give a sunny day. A ridge of high-pressure from high 1030 mb over S Europe had extended to southern Britain with 1021 mb here while frontal systems were affecting N Scotland 1010 mb with a low 1007 mb S Iceland. A fine sunny day and 24.8C here, highest of the month, and 23.7C at Gorwel Heights and 24.9C at Gorddinog AWS (Charlwood 29.6C Gogerddan 27.5C, South Newington 5.8C, Lerwick 17.4 mm, Leconfield 11.9h Hawarden 10.5h Valley 10.0h) [Max 24.8C Min 11.8C Pptn trace]. Spots of rain fell at 0740 GMT, but after that on the 15th it was another fine day with very good visibility. The overnight air minimum temperature was 16.3C, and at Gorwel Heights 17.6C highest of the month. At 0900 GMT with pressure steady on 1019 mb it was feeling warm at 0900 GMT in a temperature of 19.7C and continuing warm with the temperature reaching 24.7C in the afternoon, second highest of the month. Gorwel Heights 24.4C Gorddinog AWS 24.2C. It was hot in parts of southern Britain. Fog developed here before midnight (Frittenden 31.3C Usk 25.7C, Topcliffe 6.5C, Tyndrum 17.8 mm Hawarden 0.8 mm, Manston 10.6h Aberdaron 5.2h Valley 4.7h) [Max 24.7C Min 16.1C Rain 0.1 mm]...

The first 15-days of the month have been dry and warm. Rainfall of 31.4 mm (29%) & [33%] of averages, the large fall 15.2 mm on the 2nd accounting for most . The mean temperature 15.1C (+1.3) & [+1.2] of averages. Sunny with a mean of 3.8 hours a day.

There was fog overnight that persisted through till after 0900 GMT on the 16th resulting in a rare fog at 09 observation with sky obscured. It had been calm, but a light NE'ly breeze set in and the fog started to clear with the sun burning through, it was already brighter. With heavy dew and fog there was an amazing number and assortment of cobwebs on many conifers and shrubs in the garden, made visible by very small droplets of water. Mist lingered, but there was brilliant sunshine on the mountains and in the Ogwen valley. Pressure 1026 mb was rising with high 1031 mb over the Norwegian Sea. There was a low 1001 mb off Cap Finisterre and further W, over the Atlantic beyond Azores high 1026 mb, S of Greenland was hurricane Paulette. A dry mostly sunny day almost warm, hot in the south (Bournemouth 26.8C Cardiff 26.2C, Resallach 3.5C Sennybridge 7.7C, Aviemore 1.6 mm, Lyneham 10.7h Aberporth 7.6h Valley 7.2h) [Max 19.4C Min 12.1C Rain nil]. A very fine morning on the 17th with broken cloud, moderate hazy visibility and pressure high on 1030 mb. The best of the weather today was in North Wales. There was a cool NE'ly breeze at first that from 11 GMT to 15 GMT veered around the compass and, getting a Föhn wind off the Snowdonia Mountains for a while, the temperature reached 23.2C here and Gorwel Heights. At Gorddinog 24.1C AWS was recorded, all 3 stations exceeded the official UK high of 23.1C at Porthmadog (Porthmadog 23.1C, Shap 2.8C, Lerwick 0.6 mm, Bude 11.3h Aberdaron 11.2h Valley 10.1h) [Max 23.2C Min 11.5 Rain nil]. With the jetstream continuing to be well to the north on the 18th we had another very nice day. Pressure had fallen a little to 1026 mb, broken cloud and very good visibility. Feeling cool at first in a moderate NE'ly and 12.4C at 0900 GMT. Mostly sunny. The weather not so good on the west coast of France and Spain the result of being in the line of ex-tropical storms (Tyndrum 22.8C Cardiff 21.3C, Shap 0.7C Capel Curig 4.9C, Fair Isle 1.0 mm, Tiree 11.6h Valley 9.5h) [Max 17.1C Min 9.8C Rain nil]. Fine and sunny again on the 19th with pressure steady on 1022 mb and high 1028 mb over the N North Sea. Dry almost everywhere sunniest Irish Sea coastal areas. With low 1008 mb ex-Hurricane Alpha over the Bay of Biscay the weather in France and Spain was unsettled for the time of year (Heathrow 25.2C Usk 22.4C, Newton Rigg 1.9C Hawarden 6.8C, Chillingham Barns 0.4 mm, Morecambe 11.5h Valley 11.1h) [Max 17.6C Min 10.7C Rain nil]. A rare morning here on the 20th with no clouds in the sky at 0900 GMT, the sky was milky, not very blue. It felt rather fresh in a moderate NE'ly breeze. Pressure 1022 mb was rising with a ridge of high-pressure 1026 mb Scotland from the Atlantic. North-east coasts of England were affected by low stratiform cloud off the North Sea. a sunny and dry day (Kew Gardens 25.6C Whitechurch 22.3C, Magilligan 1.2C Hawarden 5.1C, Loftus 3.2 mm, Aberdaron 11.1h Valley 11.0h) [Max 18.6C Min 10.9C Rain nil]. There was thick fog (code 1) at 0730 GMT on the morning of the 21st, but was clearing at 0900 GMT to mist and moderate visibility. A mass of frontal cloud lay to the N and NW, but did not encroach during the day which again dry, the sixth without rain in a 'dry' spell of 10 days from the 12th (Yeovilton 26.0C Llysdinam 24.4C, Ravensworth 1.1C Capel Curig 5.1C, Harris Quidnish 8.8 mm, Leconfield 11.0h Valley 10.8h) [Max 21.2C Min 10.6C Rain nil].

The dry spell ended on the 22nd although at first though overcast and dull the raingauge was dry at 0900 GMT. Pressure 1008 mb was falling, it was misty and dull just 58W under uniform grey stratiform cloud. There was a frontal mass lying to the NW associated with low 993 mb NW of Malin head. It was sunny and the SE although misty around coasts. It kept dry through the day so I hurried along with planting out some lettuce from modules and gathering 4 bags of of firewood sticks in the wood before the expected rain. A few spots at 17 GMT then the rain arrived light from 2230 GMT turning heavy from at 23 GMT (8 mm/h) (Santon Downham 26.0C Hawarden 20.8C, Aboyne 5.1C Swyddffynnon 6.1C, Achnagart 40.4 mm Capel Curig 66 mm, Waddington 10.5h Hawarden 3.4h Valley nil) [Max 15.2C Min 11.3C Rain 22.2 mm]. Rain continued very heavy (25 mm/h) for a while after midnight on the 23rd and intermittently moderate to heavy only ceasing just after 06 GMT. There had been 22.2 mm rainfall, largest of the month, over 10h duration. At 0900 GMT the sky was clearing from the NW, visibility was very good and there was a light N'ly breeze. The jetstream had moved S and was now poised over the UK. Pressure was on 1001 mb in a weak ridge from the west. The weak cold front of last night was over central England. Fresher and bright in the afternoon (Manston 20.6C Cardiff 18.8C, Aboyne 0.0C Lake Vyrnwy 9.4C, Cambridge Niab 34.4 mm Aberporth 21.8 mm, Kinloss 10.0h Valley 5.2h) [Max 14.5C Min 9.9C Rain 3.4 mm]. AWS temperature record for 7 days ending 25 September 2020.Cooler airflows had been introduced by the 24th and at 0710 GMT there was a shower of ice pellets. At 0900 GMT the sky was clearing, it was fine and the 9.7C, lowest of the month so far, felt fresh. Pressure was on 990 mb with complex low 984 mb off SW Ireland and an occluded front North Wales. Marine closed and open convective cells were packed over the sea to the NW. There were heavy showers in S Wales and sferics were observed early in the English Channel and to the NW of the Isle of Man and North Channel. No thunder was hear here. The overnight air minimum was 6.3C, lowest since the 5.9C on 8th June. The temperature crawled up to 11.3C, lowest since the 10.4C on 11th May and lowest maximum of this month. (Manston 18.2C Cardiff 15.1C, Altnaharra -5.0C Capel Curig 3.9C, Killowen 24.6 mm Pembrey Sands 23.8 mm, Tiree 8.8h Aberporth 3.8h Valley 2.7h) [Max 11.3C Min 6.3C Pptn 3.3 mm]. A very fine morning on the 25th and again a cold N'ly wind. Pressure 1010 mb was rising with low 985 mb over the North Sea off Lincolnshire. We were in the Polar airstream, showers were driving through the North Channel, there were convective clouds developed in the vicinity, a cumulonimbus was observed. Sunny in the afternoon with a couple of light showers. Ice precipitation fell on Cairngorm Mountain, a few pockets of ice precipitation were seen in the afternoon amongst rocks on Carnedd Llewelyn (Bournemouth 16.4C Cardiff 16.2C, Tyndrum -1.5C Sennybridge 0.2C, Houghton Hall 66.6 mm Scolton 12.6 mm, Exeter 9.9h St Athan 8.9h Valley 6.5h) [Max 13.7C Min 6.7C Pptn 0.2 mm].

Fine again on the 26th with a cold strong NE'ly wind. Pressure 1017 mb was rising with low now 1004 mb Netherlands. Mostly sunny afternoon and a dry day (Prestwick 15.2C Cardiff 15.2C, Katesbridge -1.5C Sennybridge -1.0C, Tibenham 11.2 mm Bala 2.6 mm, Glasgow 11.0h St Athan 10.9h Valley 6.5h) [Max 13.4C Min 7.4C Rain nil]. Fine and sunny on the morning of the 27th at 0900 GMT. Pressure was steady on 1018 mb with a ridge to the UK from high 1027 mb off Iberia. Low 994 mb was lingering over the Netherlands. A light cool NE'ly breeze and a temperature of 10.4C. The best of the weather was in the west today, a brilliantly sunny day here and W and NE Scotland. Dry (Cardiff 18.8C, Braemar -5.0C Trawsgoed 0.7C, Brooms Barn 5.0 mm, Exeter 11.2h Hawarden 10.9h Valley 9.9h) [Max 14.8C Min 6.3C rain nil]. The 28th began dull with the sky overcast and there was a feeling of dampness in the air, but no precipitation. Pressure was on 1013 mb and the visibility very good. The wind direction had changed to SW'ly, it was warmer at 13.9C (dewpoint 12.6C) RH 92%. The day kept dry until about 13 GMT when there were couple of moments of fine drizzle with slight rain later (Ravensworth 19.0C Gorddinog AWS 19.7C Gorwel Heights 18.6C Cardiff 17.8C, Ravensworth -1.3C, Chivenor 6.8 mm Gogerddan 5.0 mm, Tiree 7.3h Hawarden 0.8h Valley 0.5h) [Max 16.8C Min 6.3C Rain 2.6 mm]. The 29th was fine and sunny, and cool again after shallow fog on the fields overnight, the temperature at 0900 GMT 10.4C (dewpoint 10.1C RH 98%). A little cumulus over the mountains to the S was increasing. Pressure 1018 mb was rising in a ridge of high-pressure from the Atlantic high 1031 mb. The afternoon was sunny (Manston 21.2C Cardiff 18.9C, Katesbridge -1.4C, Bedford 9.8 mm Rhyl 4.0 mm, Leeming 10.1h Valley 8.4h) [Max 16.4C Min 7.9C Rain 1.4 mm]. A wet and very windy morning on the 30th with gale force 8 S'ly wind at 08 GMT recorded at Valley and, if not for the shelterbelt trees here, it would be similar. As it was it was very blustery and raining moderately at 0900 GMT in a shower started just before. Pressure on 999.5 mb was falling rapidly with frontal-wave low 983 mb Rockall having frontal cloud along the western fringe. There was a warm front over Liverpool Bay and a cold front on Dublin and occluded front over Shannon all producing in turn some 'weather' over the Irish Sea. The afternoon was better, it did turn out sunny later. The best of the weather with sunny spells was in SE England (Manston 19.1C Valley 16.1C, Dalwhinnie 10.6C Lake Vyrnwy 12.3C, Redesdale Camp 1.6C, Whitechurch 33.4 mm, Wattisham 2.9h Valley 1.0h) [Max 15.1C Min 10.1C Rain 7.0 mm].

September ending with a rainfall total of 71.5 mm (65%) & [75%] of averages, was the driest month since May and lowest in September since 2015. Also the sunniest since May with 158.8h recorded at RAF Valley most since 2015 ranking 13th in September on the Anglesey record since 1931. Temperatures were near the normal with a mean temperature of 14.0C lowest since 2018, but ranking 17th in station records since 1979.


October 2020

October 1 - a bright and chilly morning, fine and sunny with just 2 oktas of developing cumulus clouds. Slightly misty good visibility with no snow on the Snowdonia Mountains. The temperature at 0900 GMT was 8.1C and it had been down to 1.8C on the grass. Storm Alex, named by Meteo France, was developing SW of Ireland expected to reach Brittany 991 mb at midnight with severe winds along the Channel coast and Cornwall. Pressure here 998.5 mb was falling. We had a sunny afternoon pleasant enough for a cup of tea and slice of buttered home-made #lockdown sourdough Bara Brith, in our still colourful garden. The 18.7C max temperature was nice and some red admiral and comma butterflies put in an appearance as well (Frittenden 16.8C Usk 15.3C, Katesbridge -1.4C, Lerwick 33.0 mm Swyddffynnon 10.8 mm, Dundrennan 10.7h Valley 8.2h) [Max 13.7C Min~ 5.8C Grass 1.8C Rain trace]. The 2nd began fine with a cold feeling NE'ly wind and just a patch or two of blue sky showing through stratocumulus overhead. Pressure 996 mb was rising with low 968 mb over Cherbourg. The cloud was thickening and we had spots of rain and drizzle around noon and a brighter spell with a glimpse of sunshine around 1330 GMT with a return of dull conditions with further drizzle all amounting to very little volume in the raingauge. The best of the weather was in Scotland and NE England where mostly sunny. In the south strong winds and some heavy rain associated with Storm Alex (Auchincruive 16.2C Hawarden 15.2C, Pennerley 9.6C Libanus 9.7C, Shap -2.4C, Liscombe 65.0 mm Wiggonholt, Sussex 58.2 mm Tredegar 34.0 mm, Kinloss 10.5h Valley 1.2h) [Max 14.4C Min~ 8.0C Grass 4.6C Rain 0.2 mm].

¤10.7

 





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Acknowledgements

I am grateful to the NOAA Air Resources Laboratory (ARL) for the provision of the HYSPLIT transport and dispersion model used in the preparation of trajectory plots on these pages.

Stein, A. F., Draxler, R. R., Rolph, G. D., Stunder, B. J. B., Cohen, M. D., and Ngan, F., (2015). NOAA's HYSPLIT atmospheric transport and dispersion modeling system, Bull. Amer. Meteor. Soc., 96, 2059-2077.

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