The observer and author.

Llansadwrn (Anglesey) Weather

Last Month's Diary

Logo: Llansadwrn Weather - Melin Llynnon, Ynys Môn


Where you see these icons click for a pop up graphic
Example icon - Satellite image. Example icon - Photograph. Example icon - Map of sferics. Example icon - A graph or diagram. Example icon - Analysis chart. Example icon - Weather chart.


Most pop up graphics in the diary are self closing on next click of mouse.
Please continue to close older graphics on some other pages as usual.

 

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 (first indications) are given in bold. When averages are referred to (.) compares with the last decade and [.] with the 30-y climatological average [currently 1971 - 2000]. All data are subject to verification and amendment.

Click for home page



April

1st: A bright morning and with the sky clearing from 6 oktas stratocumulus and cumulus clouds the morning became sunny with fair-weather clouds predominating. Pressure 1014 mb was rising with low 993 mb just N of Scotland. The SW'ly wind was force 5 and continued force 5/6 through the day. The temperature reached 14.3C and with relative humidity 60% was a good drying day. The soil is still very wet and still unfit for cultivation, a few fields have been ploughed and sown, but local opinion was they were taking a chance. The afternoon continued mostly sunny and the evening clear so that there was a fine view of the European ATV, just ahead of the International Space Station the brightest object in the sky, overhead the weather station between 2028 and 2034 GMT. (Global solar radiation 15.08 MJ m-2.)[Rain 1.4 mm; Max 14.3C; Min 7.3C; Grass 4.8C]
Ivy-leaved scurvy grass flowering on roadside in Llansadwrn. 2nd: A dull morning with drizzle, fine to light and interspersed with light rain from 06 GMT accumulating 1.4 mm by 09 GMT. Pressure 1025 mb was still rising in a ridge with high 1023 mb over the Bay of Biscay and low 999 mb SW Iceland with low-pressure extending into mid-Atlantic. Pressure was also low over the North Sea and Baltic. The morning kept dull with the poor visibility improving to moderate as drizzle petered out for a while before returning by noon for a while. Later the afternoon was dry and mostly windless, but with a strong gust that disturbed a pile of dry leaves I had gathered in the garden! At the end of the afternoon the sun appeared obscured by thin cloud, but there was no bright sunshine (Global solar radiation 7.64 MJ m-2.). The evening was clear at first, but was overcast again before 21 GMT. [Rain 0.1 mm; Max 13.7C; Min 7.0C; Grass 2.8C]
3rd: Pressure 1033 mb was rising, but we had anticyclonic gloom again today. At least the drizzle had stopped and paths were dry although the grass was wet with dewdrops, probably guttation. Soil temperature was 10.1C at 5 cm and the air temperature 9.7C 1.2 m above ground inside the Stevenson screen. Pressure was high 1035 mb to the SW and there was little (SW'ly) or no wind, visibility was poor counting as mist as the relative humidity was 97%. The salt tolerant ivy-leaved scurvy grass Cochleria danica was just coming into flower along the A5025 Menai Bridge to Pentraeth road; it had plenty of salt put on during the winter! More cutting of flowering gorse along the A55 near the Britannia Bridge has been taking place. The need for cutting here seems obscure to me and anyway was being done out of season (after the end of March) when birds have started to nest. Nesting is getting earlier and gorse is a favoured habitat. More flowers had opened on the damson tree in the garden and the wild cherry flowers were just starting to open. There was plenty of birdsong around the weather station and in the wood, with declining interest in the food provided. This usually happens went birds turn to nesting activity, but they come back later. Great tits and long tailed tits have been gathering nesting material and blue tits have been inspecting nesting boxes. By afternoon the cloud was thinning becoming bright with the temperature reaching 14.8C. The sun finally broke through giving some sunshine and for a while a clear evening when brown long-eared bats were seen flying for the first time this year. Later patchy cloud encroached. [Rain 0.0 mm; Max 14.8C; Min 8.0C; Grass 4.6C]
Small tortoiseshell butterfly drying wings on path in the garden. View from the other side of the field. View across the top of a yellow flowering gorse hedge. 4th: With partially clear skies fog form after midnight and was thickest between 04 and 06 GMT. By dawn it was clearing and at 09 GMT these was very good visibility of >40 km. Pressure 1029 mb was falling as the high 1031 mb over the SW Approaches declined. Complex low-pressure to the N was expected to move S to bring colder arctic air and wintry showers over the next few days, such are the vagaries of the weather. Hopefully, there will not be frosts to affect flowers on the fruit trees that are just appearing. The sky was beginning to clear and the day turned mostly sunny. Mist off the sea affected the west coast and western Menai Strait during the afternoon, but here it kept sunny. Two small tortoiseshell butterflies were seen around the garden. Later cloud encroached as the wind veered N'ly and there was showery rain from 1830-2100 GMT as a cold front moved S. (Solar radiation 12.70 MJ m-2. Valley 2.9h) [Rain 1.9 mm; Max 13.8C; Min 8.1C; Grass 6.0C]
5th: There were a few clear spells overnight and the grass minimum fell to -2.3C. After a spell of rain between 0500-0530 GMT on another cold front heading S the sky started to clear just before 09 GMT. Pressure 1020 mb was falling with low 998 mb over the Baltic and high 1045 mb Greenland. We were in a brisk and showery N'ly airstream. The sky further cleared giving sunny spells in the morning with cumulus clouds in the vicinity. The afternoon had mostly clear sky overhead, a line of stratocumulus clouds persisted over the Snowdonia Mountains. During the evening cloud began to move in off the Irish Sea and we had a moderately heavy shower of 5-7 mm snow pellets at 2210 GMT almost covering the ground but quickly melting. [Rain 1.5 mm; Max 8.8C; Min 2.3C; Grass -2.3C]
View of snow covered Yr Wyddfa & Crib-y-ddysgyl from Llansadwrn. 6th: Bright with sunny spells with hail and or snow lying on the Snowdonia Mountains, including Moel Eilio and summits westward. Further showers of small snow pellets (1-3 mm) soon melting on the ground here with further light accumulations above 400 ft on the mountains. Pressure 1010 mb was falling and showers were moving in off the Irish Sea on the light to moderate N'ly wind. Opening the door to the garden before 09 GMT to do the observations it sounded like summer with the chorus of birdsong including chiffchaff, and blackbirds singing particularly strongly with females sitting on eggs in early nests, but the temperature of 1.7C told a different story. The overnight minimum temperature was -0.1C, lowest of the month and only air frost. There were frequent showers of snow pellets and a few flurries of snow (1340 and 1555 GMT) through the day, but insufficient here to lie on the ground. In between there were spells of sunshine and with the temperature reaching 5.5C, lowest in April since 2000 and 4th lowest since before 1979, it felt cold in the persistent force 3/5 N'ly wind. Early in the day in the west of Anglesey there was snow lying in Brynsiencyn and sufficient at Trearddur Bay for children to build snowmen; parts of England had several centimetres with snow was reported on the beach in Brighton. Snow closed Gatwick Airport and there were problems clearing runways at Heathrow and a shortage of de-icing fluid for aircraft. The day's maximum temperature 5.7C was the lowest of the month. [Rain 0.5 mm; Max 5.7C; Min -0.1C; Grass -2.5C]
Cumulonimbus with precipitation at 1312 GMT: looking W in Llansadwrn. Ice preciptation: About snow and types of hail . 7th: A band of showers moved in off the Irish Sea after midnight and there was a shower of snow pellets and snow around 0130 GMT, but the air temperature did not fall below 0.5C. Temperature on the grass dropped to -3.8C, lowest in April since 2006. It was a fine morning with sunny spells with snow lying on the mountains as low as 1000 ft near Llyn Ogwen. The temperature at 09 GMT had risen to 5.7C and and attributed to past 24-h was ranked 5th lowest in April since 1979. Pressure 1004 mb was falling slowly and there was a force 3/4 NNE'ly wind. The day was marked by sunshine and showers, mostly light snow pellets here missing out on any heavy ones that occurred further west. Towering cumulus , or cumulonimbus with precipitation were seen in the vicinity such as in the photo moving to the left (S) across central Anglesey. The MODIS Aqua satellite image (below right) captured at 1340 GMT shows the development of the convective clouds over Ireland and the west, with a line of cumulonimbus off Anglesey. Clouds coloured blue stand out against the green of the land surface in this image using sensor channels 7-2-1. Marine open celled convection can be seen to the north-west of Ireland. Another was the earlier NOAA 18 image at 1224 GMT showing the convective clouds over Anglesey and Wales Noaa 18 image showing convective cloud development at 1224z over Anglesey and Wales.. After the showers passed over the mountains clouds of advection fog formed over the summits, this was seen well on Mynydd Perfedd and Elidir Fawr at 1235 GMT Clouds of advection fog formed over mountains after passage of heavy showers. , but was on Carnedd Dafydd as well. Between the mountains standing out because of the snow the 'buzzard eyed', we have no eagles, will have spotted the Marchlyn Mawr reservoir Marchlyn Mawr reservoir. the upper storage reservoir of the Dinorwic Pump Storage Station. The rim of the reservoir is about 2100 ft above sea level. The station within the mountain Elidir Fawr was commissioned in 1984 and is the largest of its kind in Europe. Towards evening the showers died out and the sky cleared with frost on the grass. [Rain 2.6 mm; Max 9.5C; Min 0.5C; Grass -3.8C]
MODIS AQUA image at 1340 GMT on 7 April 2008, courtesy of the Rapid Response Team at NASA/GFSC. 8th: After midnight cloud moved across and there were showers of snow pellets and unknown precipitation from 0300 to 0600 GMT. The temperature at the start of precipitation was 1.5C and it is likely it would included ice, sleet or possibly snow at the beginning before the temperature rose and latterly rain. There was fresh snow on the mountains lying at 1500 ft down to 1000 ft at 09 GMT. The grass minimum of -4.4C was lowest of the month. Pressure 1003 mb was rising and there was a light SE'ly wind. The morning was bright with occasional glimpses of the sun and light showers. The afternoon was cloudier with moderate to heavy shower commencing 1300 GMT included snow pellets and sleet. The temperature fell 3C during the precipitation; there was further snowfall on the mountains above 2500 ft. Later the sky more or less cleared, as convection died down, and the evening was clear with temperature on the grass falling to -3.4C. [Rain 6.4 mm; Max 8.5C; Min 1.1C; Grass -4.4C]
9th: With a showery trough passing over Anglesey there were showers of ice pellets and rain from 0750 GMT and snow pellets and rain around 09 GMT. The temperature fell to 3.6C and visibility moderate to poor. Pressure was 999 mb in a low-pressure area surrounding Britain. Soon it was brighter, but the sky was slow to clear to give a few sunny spells by the end of the morning. Convection was not as strong today and while the sky remained mostly cloudy in the afternoon cumulus clouds developed weakly. The sky was cleared for a while in the evening when there was a touch of ground frost (-1.3C). Rain 0.5 mm; Max 11.5C; Min 1.3C; Grass -3.4C]
Carneddau with snow under towering cumulus clouds. 10th: A fine sunny morning at first with layered altocumulus clouds. Dark clouds could be seen in the west as there was a band of showers on an approaching cold front. There was a little fresh snow on the tops of the Carneddau Mountains and snow was persisting at 1500 ft and at 1300 ft in Cwn Idwal. At 09 GMT pressure 999.5 mb was falling with low 985 mb to the NW; there were towering cumulus to the S. Rain was reported at Valley, but it took another 2 hours for fine drizzle to arrive here. The afternoon, once again, was brighter and there were good sunny spells. With a light Föhn-like SSE'ly breeze off the mountains relative humidity dropped to 52% and the temperature rose to 12.8C around 15 GMT; temperatures on the snow-covered mountain summits were below freezing. There were further shower in the evening with rain and small ice pellets close to 1900 GMT. {Hawarden 10.7C} [Rain 5.4 mm; Max 12.8C; Min 3.3C; Grass -1.3C]
11th: After a lull from midnight there were further showers and small ice pellets from 0300 GMT, but these had cleared by dawn. It was bright at first with even a little weak sunshine before another band of showers arrived just before 0900 GMT. Pressure was 989 mb near the centre of a low over the Irish Sea and it was calm. The temperature was 4.5C, dewpoint 3.0C and in the rain shower visibility was good to moderate. Snow was falling as low as 1000 ft in the Nant Ffrancon Pass and snow was lying moderately thickly at 2500 ft and thinly at 1800 ft. When it could be seen earlier, between showers, Moel Eilio had a nice white cap with snow as low as 1500 ft. David Small reported that snow on the Clwydian hills at about 1000 ft could be seen from Chester for the second times this week, but not unusual for April. The morning had further slight showers with a few bright spells, and a heavier one at noon of rain and small ice pellets, well it is April. The soil is still very wet and unworkable in the garden, cattle have were put on some drier fields about a week ago. The afternoon was mostly cloudy with a few sunny spells and kept dry here. There was showery rain from 1900 GMT containing small ice pellets at times. {Hawarden 10.0C Capel Curig 23.6 mm} [Rain 9.9 mm; Max 11.0C; Min 3.1C; Grass -0.5C]
12th: Rain continued after midnight with a moderate to heavy burst just before 01 GMT containing more small ice pellets. It was a bright enough morning with brief sunny spells between cumulus clouds, some towering and one cumulonimbus over the mountains of Snowdonia. Despite some snow overnight at higher levels the main snowline had retreated to 2500 ft on some mountain slopes but on the north-facing Carneddau it was still at 1800 ft , and lower in places near Cwm Idwal. The afternoon was mostly dull with a few spots of rain later. At 1825 GMT there was heavy rain and medium ice pellets. [Rain 11.0 mm; Max 11.0C; Min 2.8C; Grass -0.6C]
Leaves expanding on horse-chestnut and flowering heathers. 13th: A slowly falling temperature overnight from 6C to 3.7C, but no ground frost. There was wet snow on the mountains at 1000 ft and at 800 ft for a while on the eastern range of Carneddau Mountains. The wind was E'ly and pressure 1008 mb rising as the frontal-wave low that had been slow-moving over North Wales in the night moved away. The sky was starting to clear and by 1015 GMT mostly sunny on Anglesey. Although there was some cloud around noon the afternoon sky was mostly clear with stratocumulus left over Snowdonia. The evening was clear too and the day dry. [Rain 0.0 mm; Max 10.1C; Min 3.7C; Grass 2.8C]
Stratocumulus cloud over Snowdonia viewed from Llansadwrn. 14th: There was a white frost on the grass at dawn with the grass minimum reading -2.5C. It was a bright morning with cumulus clouds increasing up to 09 GMT. Pressure 1020 mb was rising with high-pressure building to the SW of Britain. Although the morning turned cloudier with showers in the vicinity it kept dry here with sunny spells with good visibility. The sky started to clear in the afternoon leaving a bank of stratocumulus cloud over the mountains. The mountain snow at sunset turned a pink colour; the evening and most of the night were dry and clear. [Rain 3.4 mm; Max 10.1C; Min 2.2C; Grass -2.5C]
15th: Dew on the grass froze, as the temperature dropped to -4.1C, and was there at sunrise, but melted rapidly. By 07 GMT showers were moving across and there was a prolonged shower of rain and medium sized ice pellets from 0730 GMT making up the 3.4 mm rainfall recorded for the past 24-h. At 09 GMT the sky was clearing again with pressure 1023 mb rising. The day was mostly sunny, with the temperature rising to 13.2C. The evening and night were mostly clear with frost on the grass. [Rain trace; Max 13.2C; Min 1.1C; Grass -4.1C]

The first 15 days had a mean temperature of 7.3C (-1.8) and [-1.3] of the April average with the highest maximum 14.8C (-3.8). Rainfall was 44.6 mm (57%) and [77%].

16th: Frozen dew on the grass persisted after sunrise until just before 09 GMT in shady places. The sky was mostly clear, but for here there were an unusual number of contrails drifting across with an E'ly air flow. Pressure 1021 mb was falling with high-pressure 1027 mb over the North Sea and S Norwegian Sea and low pressure 979 mb S of Greenland. Cloud did increase during the morning, but mostly cleared in the afternoon with the temperature rising once again to 13.2C in a light E'ly breeze. Solar radiation of 23.20 MJ m-2 was highest of the year so far. The evening was clear, but there was no frost. [Rain trace; Max 13.2C; Min 1.2C; Grass -3.1C]
Cumulus clouds over snow capped peaks seen near Bethel. 17th: Cloudier after midnight and a slight shower of rain at 0745 GMT hardly wetted the ground and was unmeasurable. Pressure 1012 mb continued to fall with the high 1026 mb N Scotland and S Norwegian Sea with low 988 mb on an occluded front off the Bristol Channel to the SW. The morning was mostly cloudy with the odd bright spell. Visibility was just good (10 km) obscured by moderate smoke haze. The afternoon was sunnier with the cloud mostly clearing and the temperature rose to 10.7C, moderated by the moderate to fresh E'ly. The evening was mostly clear. [Rain 0.0 mm; Max 10.7C; Min 3.1C; Grass 1.8C]
18th: Overcast with low stratocumulus clouds, sometimes looking dark. Visibility was good with moderate smoke/dust haze. No frost again overnight and the grass dry with the soil surface looking drier too. The moisture content is currently an average 66% of dry mass, down from 75% a month ago. Parts of the garden are drier (58%) and some still very wet (76%). Pressure 1002 mb was falling with complex low-pressure 975 mb over the Bay of Biscay and high 1024 mb SE Iceland. In between we were experiencing the easterly air flow (force 4 to 5) resulting partly in the poor air quality with moderate levels of pollutant ozone, and suspended dust. The morning kept cloudy with moments of brightness as the cloud thinned revealing an obscured sun. The afternoon was overcast with patches of brightness seen sometimes over the mountains where snow persisted, but visibility improved. The evening and night were similarly cloudy, dry and windy. [Rain 0.0 mm; Max 9.0C; Min 2.9C; Grass 1.2C]
Haze obscures the view of the Carneddau Mountains. 19th: Little had changed in the synoptic situation, we still had the ENE'ly wind at force 5 with pressure low to the S (991 mb Channel) and high 1021 mb Iceland. Pressure here 1001 mb was rising and the temperature at 09 GMT 6.8C, dewpoint 3.8C. An occluded front was lying from S Ireland through Wales to E Anglia and the sky was overcast and the day sunless, just to the N in Tiree Is there was 13.6 h of bright sunshine. The surface soil continued to dry, the tops of mole hills were dry with undisturbed soil on the observation plot almost dry. Evaporation over the past 5 days has been 8.4 mm measured by the Piche evaporimeter. [Rain 7.9 mm; Max 9.1C; Min 5.5C; Grass 4.5C]
20th: There was light to moderate rain from midnight until 0730 GMT then drizzle. It was a very murky morning with further fine drizzle and the odd spot of rain. The occluded front had moved a little N and was over Anglesey and Merseyside. Pressure was 1005 mb and the wind still force 4 ENE'ly. The slight drizzle and spots of rain continued in the afternoon without wetting much even when you were out in it. The temperature rising from a minimum of 5.5C struggled to reached 8.3C during the day and falling to 5.5C again overnight. In parts of S England temperatures soared reaching 18.6C in the Solent, even Pembrey Sands had 14.8C. Stornoway was sunniest with 13.0h sunshine duration. The 3rd sunless day with solar radiation of 5.36 MJ m-2 lowest of the month and since 20 March ! With the frontal cloud drifting N and fragmenting the evening was drier and by midnight the full moon was seen in a hazy sky. {Solent 18.6C, Lake Vyrnwy 3.7C (day 6.2C, Stornoway 13.0h} [Rain 0.2 mm; Max 9.2C; Min 5.5C; Grass 4.8C]
21st: A bright hazy morning, the first for 3 days, with some sunshine breaking through cirrus clouds (6 oktas cover). We still had the E'ly wind, force 4, but pressure 1009 mb was rising with high 1023 mb Norwegian Sea and complex low 993 mb N France. There were some patches of snow still to be seen on the mountaintops. The morning was sunny with the temperature at 09 GMT 9.2C the maximum of the past 24-h. The afternoon had further hazy sunshine with visibility deteriorating from moderate to poor and temperature rising to 12.3C. {Hawarden 15.2C, Stornoway 12.0h, Valley 5.8h} [Rain 0.0 mm; Max 12.3C; Min 5.5C; Grass 4.1C]
Cors Goch National Nature Reserve. 22nd: A clear sky morning with hazy sunshine, but poor visibility with dust high in the atmosphere. Pressure was 1010 mb and there was a light NE'ly breeze. Our first swallow was seen near Llanbedrgoch on the way to Cors Goch where grasshopper warblers were heard singing like sewing machines across the mire. The mire itself was still looking very brown with standing died back reeds yet to begin this season's new growth and the boardwalk was flooded with several inches of water  Click to see a picture. . Some of the trees were beginning to look green and some wood anemones were seen in woodland Wood anemone flowering at Cors Goch.. The afternoon was sunny and in a light variable, but sometimes SE'ly, breeze off the mountains the temperature rose to 19.2C, highest of the year so far. The evening was clear with pipistrelle bats around at dusk, but encroaching frontal cloud was seen in the west.{Southampton 20.7C, 11.4h, Trawsgoed 18.7C, Fair Isle 8.7C} [Rain 1.2 mm; Max 19.2C; Min 5.3C; Grass 3.2C]
23rd: There was light rain between 01 and 02 GMT and at 0630 GMT thick fog with visibility only 100m across the fields. At 0800 GMT the cloud started lift and with visibility 4 km the sun began to break through. At 09 GMT pressure 1015 mb was rising; there were 6 oktas of mainly cumulus clouds, but visibility was restricted by low cloud and mist on lower slopes of the mountains. By 11 GMT there were just 3 oktas cover of cumulus clouds and very good visibility. A few more bluebells have opened over the last few days and sycamore leaves are expanding rapidly, but there is no sign of leaves on beech or ash. Flowers on the wild cherry were opening this morning, trees in sheltered locations at sea level have been in flower for about a week. The day became mostly sunny, but windier in the afternoon the SW'ly reaching force 4/5. The sky was almost clear later just before frontal cloud encroached. {Hawarden 16.6C, Aberporth 9.9h, Valley 9.0h, Milford Haven 7.3 mm} [Rain 3.1 mm; Max 16.0C; Min 8.0C; Grass 5.9C]
Wood anemone, habitat view. 24th: There was rain between 0315 and 0345 GMT on a gusty cold front then showers around 05 GMT before starting to clear. At 09 GMT the S'ly wind was force 5 and pressure 1015 mb was rising and the day became mostly sunny with solar radiation of 24.60 MJ m-2 and 9.9 h sunshine duration recorded at RAF Valley. {Hawarden 15.4C, St Athan 10.5h} [Rain 0.1 mm; Max 14.9C; Min 8.0C; Grass 5.9C]
25th: It was a damp and grey morning setting the scene for the day. Soil temperatures down to 1 m were all 10C, or more, for the first time this year. This notable event occurred on 9 April 2007 and on the 21st in 2006. It was dull with slight rain at times m most between 1730 and 1830 GMT, the day was sunless. The evening and night were drier, but rather windy. [Rain 2.0 mm; Max 12.6C; Min 7.6C; Grass 4.8C]
26th: The overnight air minimum temperature of 9.7C was highest of the month. A little brighter this morning with a hole in the cloud sheet. The cloud 7/8th comprised mainly moderately high altostratus with under layers of altocumulus and cumulus. Pressure 1020 mb was rising and the afternoon had good visibility with some brighter spells developing, but remained sunless. [Rain 4.0 mm; Max 13.4C; Min 9.7C; Grass 8.4C]
27th: At midnight frontal cloud stretched from W of Iberia through St George's Channel and Irish Sea to Norway, associated with low 987 mb over the Norwegian Sea. At 09 GMT pressure 1014 mb was falling slowly in a slack pressure area and it was calm. It was one of those mornings that had Anglesey enveloped in low cloud and mist. There was 100% relative humidity and visibility very poor, 1 km. All thermometers in the screen were reading 9.8C, as they should after resetting the maximum and minimum. It was calm and a good time to check that all were reading the same and agreeing with the NPL certificated thermometer. With 100% RH the dry and wet bulbs read the same, in fact they were all acting as wet bulbs. Blackbirds and thrushes were singing, the males having little to do at the moment with females sitting on eggs. There was little change until late in the afternoon when the sky brightened from the W and some sunshine broke through by 16 GMT, but it did not last long and the evening was dull once again. With the morning very dull, despite a little sunshine, solar radiation was 7.02 MJ m-2 2nd lowest of the month. The evening turned cloudy again and there was a moderate shower of rain from 2230 GMT and continued showery through the night [Rain 8.9 mm; Max 12.0C; Min 9.5C; Grass 8.9C]
Menai Strait at Beaumaris on a clear sunny morning.
¤ 28th: Overcast with slight rain up to 09 GMT. Pressure 1001 mb was falling with low 997 mb over the Norwegian Sea and frontal wave low 995 mb off NE Scotland. The showery trough over Anglesey and N Ireland was just starting to move away. There were puddles of water around the garden and visibility moderate in rain and mist. A blackcap and chiffchaff were singing strongly in the trees. By afternoon the sky was clearer and there was plenty of sunshine and clear visibility. Snow patches on the mountains are now confined mainly to the NE flank of Carnedd Llewelyn. The evening was clear and on the grass the temperature went down to 0.6C. [Rain 1.3 mm; Max 12.7C; Min 6.5C; Grass 3.3C]
White and blue bluebells in the wood in Llansadwrn. Hedgerows and trees are greening with new leaves. 29th: A sunny morning with a light NE'ly breeze. Visibility was very good >50 km affording fine views of mountains and Lleyn Peninsula. Pressure 996 mb was falling within complex low-pressure with low 992 mb to the N of Scotland and low 988 mb over the Celtic Sea. Pressure was high 1024 mb over Finland and W Russia. During the day the low moved over SW England and brought rain, on an occluded front, there and to South Wales with Milford Haven recording {30.4 mm}. The morning here was mostly sunny then cloudier by noon. The afternoon had some good sunny spells before showery rain developed around 1500 GMT. As the front moved N there was moderate rain from 2200 GMT. {Crosby 16.3C, Valley 13.8C, Tiree Is 12.9h, Valley 9.5h, Milford Haven 30.4 mm}[Rain 10.5 mm; Max 13.5C; Min C; Grass C]
Late April snowfall on the carneddau Mountains. 30th: With the low 986 mb at midnight slow-moving over SW England moderate rain continued until 0400 GMT. By morning there was a fresh fall of snow on the mountains above 2700 ft. It was a dull morning, although pressure 988 mb was rising and the slight rain eased by 11 GMT the morning remained dull. The afternoon had further slight rain from 1500 to 1930 GMT and the day was sunless with the temperature rising to only 7.7C. Before midnight there were a few holes in the cloud sheet. [Rain 2.4 mm; Max 9.2C; Min 6.0C; Grass 5.5C]

The month ended with a rainfall total of 86.2 mm (110%) and [149%] of the monthly averages. The mean temperature was 8.3C (-0.8) and [-0.3], the mean maximum was 11.9C [(-0.9)] on both averages while the mean minimum was 4.7 (-0.8) but [+0.3] of the 30-y average. Sunshine duration was an estimated 168h with 7 sunless days.

Click for latest diary Latest diary

These pages are designed and written by Donald Perkins: Copyright © 1998 - 2008

Disclaimer

http://www.llansadwrn-wx.co.uk

Top Back Site map Home page