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Llansadwrn (Anglesey) Weather
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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 (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.
1st: Light rain from 0100 - 0530 GMT then some drizzle accumulated 7.5 mm that was credited to the 31st May (see above). At 09 GMT the sky was still overcast, but the cloud was thinning and was lifting from the lower slopes of the mountains that were still looking misty. Pressure was 1014 mb with high 1018 mb over the North Sea while low 988 was SE Greenland. An occluded front over Anglesey was slow-moving towards Merseyside arriving there about 1400 GMT. The morning kept dull and overcast, dry at first then with the cloudbase lowering again some drizzle came along before noon, reducing visibility from good to poor, before 30 minutes of light rain to 1230 GMT although nothing was evident on the rainfall radar. Soon the sky began to clear and there were some sunny spells. The grass looked a little greener after the rain and the vegetables had perked up too. The temperature rose to 13.9C, lowest of the month. By the end of the afternoon the sky was clear overhead and later shallow fog formed on the fields this persisting overnight. Brown long-eared bats were seen flying around the weather station at 21 GMT. {Kinloss 20.0C, Milford haven 17.7C} [Rain 1.0 mm; Max 13.9C; Min 10.4C; Grass 9.4C]
2nd: After shallow fog at 05 GMT cleared it was a fine and sunny morning with just a few small cumulus clouds seen over the Snowdonia Mountains. The morning was mostly sunny with the temperature rising to 21.7C before a NE'ly breeze off the sea came along. The wind was initially S'ly, but by afternoon convergent cloud had formed (sea breeze front) over the weather station as the NE'ly strengthened. There was a rapid fall in temperature to 16C that was maintained through the afternoon although the sky cleared again later. The evening was sunny. [Rain 0.0 mm; Max 21.7C; Min 8.2C; Grass 4.6C]
Bodnant Garden dates from 1875 and is one of the finest gardens to see specimen trees in a natural setting, including over 100-y old giant American Californian Redwoods (146 ft) and Oregon Douglas Fir (158 ft) and, at this time of year, flowering rhododendrons and azaleas
many varieties of which were grown at Bodnant all growing well in our climate and soils
. Established by Henry Pochin, an industrial chemist, the garden was given to the National Trust in 1949 by Henry McLaren, 2nd Baron Aberconway, and is managed by his descendants that retained the house (1792)
. The Lily Terrace has a fine view of the E-facing slopes of the Carneddau Mountains
. Many of the trees and Rhododendrons grow on the sides of the Hiraethlyn River valley
, cut by melt-water from the overflow of an ice-dammed lake during the latter stages of the last Ice Age. The Denbigh type soils, typical of a large part of Wales, are slightly acidic being low in calcium and other nutrients and suit the growing of califuge plants including Rhododendrons and woodland. It was a warm sunny day and parts of the garden were perfumed by the aromatic leaves
and scented pure white flowers of Mexican orange blossom
. The garden recently described, unfairly I thought, as 'an old man's garden', is being restored
and re-developed in parts
by a team of gardeners under Head Gardener Troy Smith. To have started planting Bodnant over 100-y ago required vision: To maintain the garden today needs a lot of work, make a visit soon and see for yourself.
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In Red Wharf Bay there is a salt marsh (open panorama above) that has typical hummock and channel formation. Plants (halophytes) that grow on salt marshes are tolerant of salt water to a greater or lesser degree. On a rising tide the sea flows into the channels, and unless it is a spring tide the tops of hummocks rarely become inundated with salt water
. The tops of the hummocks have a flora including sea pink (thrift) and sea plantain, but both also grow on mountains too
. Smaller and sometimes missed, growing on the driest parts of the marsh, is the sea milkwort that is a member of the Primulacae
. The plant also occurs in saline habitats in Staffordshire and Worcestershire.
13th: We had a shower of rain around 0200 GMT with just 0.4 mm caught in the rain gauge. A dull start to the day with a few small spots of rain on the window at 07 GMT. The windvane indicated a change in direction of wind to SW, a ridge 1015 mb began to move into S Britain from large Atlantic-high 1032 mb N of the Azores. The Biscay low had moved towards Gibraltar, but had filled and was losing its identity over the Mediterranean. But, a thundery low 1010 mb developing over the Western Isles of Scotland, with associated frontal cloud, was over Britain and the Irish Sea. At 09 GMT the chiffchaff was still singing together with 2 blackbirds, but birdsong has fallen off. There are lots of fledglings about, families of blue and great tits visit the feeding stations. Two families of woodpeckers also visit (the second of the season), the parent (female right) shows the fluffy youngster with red cap (left) how to feed on the peanuts. Males often do this; birds of other families are not tolerated although we have more than one feeder squabbles develop. A wren is sitting on a late clutch of eggs in a nest, previously built by the male, on top of an unused swallow nest under the eaves of the house above the front door, and holding up maintenance work! Bands of showers in the N began to move SE during the day, the first was at 1130 GMT, interspersed with a little sunshine. During showers at 1625 GMT thunder was heard to the SE of the station. In Llanfairfechan at the same time there was thunder and 'ferocious' ice pellets for a few minutes; thunderstorms and heavy downpours were reported in parts of the Midlands eastwards during the evening. By evening the wind had veered to the NE, giving a fresher feel. At 2100 GMT with a clearing sky it was still light enough to read thermometers, but soon became cloudy again with a shower of rain at 23 GMT. [Rain 4.4 mm; Max 15.5C; Min 9.8C; Grass 8.1C] With 11 of the first 15-days dry rainfall of 21.6 mm was running 34% of the average for the month. The mean temperature was 14.2C (-0.1) and [+0.6] of average..
16th: Overnight a clear sky allowed the temperature on the grass to fall to 5.5C so there was some dew. Another fine and sunny morning with 6 oktas cover of high cirrus cloud and, unusually for here many contrails some expanding forming cirrocumulus. Visibility was very good with slight haze and with persistent, but lighter NE'ly winds off the sea the temperature rose to 18.3C during the afternoon. [Glasgow 23.5C, Pembrey Sands 22.1C, Hawarden 20.9C, Capel Curig 19.8C, Valley 19.6C, 14.3h, Aberporth 15.7h] [Rain 0.0 mm; Max 18.3C; Min 8.6C; Grass 5.5C]
17th: A cloudy morning at first, but after 09 GMT began to burn away to give a sunny day on Anglesey although cumulus clouds persisted over the Snowdonia Mountains. The temperature rose to 18.8C in the force 3/4 NE'ly breeze. If you found a sheltered spot it felt a lot warmer. The growth of grass at the weather station this year to this date (2. 8 tonnes per hectare) has been the lowest since before 2004 (7.2 tonnes per hectare) due to a combination of low temperatures in the spring and low rainfall. Soil moisture today was 26% dry mass, well below the 72% saturated water percentage and low enough to limit grass growth, but above the permanent wilting percentage of 15%. In parts of the island grass on shallow soils around rocky outcrops and roadside verges has looked yellowish brown for a week or two. During the evening visibility reduced to moderate to poor and the sky looked very murky. [Rain 0.0 mm; Max 18.8C; Min 12.0C; Grass 8.5C]
18th: At midnight with low 1003 mb over the Baltic associated frontal cloud over Scotland was moving S and began to encroach here by 03 GMT when low mist formed on the fields turning to a 'dry fog' by 06 GMT. At 09 GMT fog was lingering in mountain valleys with mountain tops in the clear, while visibility had improved to moderate here. Grass, concrete and soil were all dry, a dry or non-wetting fog has a very small droplet size and does not wet anything. Pressure was 1023 mb influenced by the Atlantic-high 1030 mb, a weak cold front was just to the North, but a detached warm front lay to the West. The sky was overcast with the air temperature 14.2C (dewpoint 12.0C, RH 87%) and soil temperature at 5 cm depth 18.0C. By 1045 GMT the cloud had thickened and there were spots of rain for about 15 minutes, these evaporating and not wetting the ground. The afternoon was overcast at first, brighter later and as the cloud moved further S began to clear around 17 GMT. [Rain trace; Max C; Min 9.0C; Grass 6.5C]
19th: Mostly cloudy around 06 GMT and beginning to clear by 09 GMT with fair weather cumulus clouds moving from the N across the sky. Winds were strong on the North Sea around low 993 S Sweden. Showers affected the East coast through the day, but here cloud cover reduced and visibility improved to very good by the afternoon although the NE'ly breeze was cool with the highest temperature rising to 13.3C. In slight haze I could no longer see the diminishing snow-patch on the Carneddau without the aid of binoculars, but it was still there during the afternoon. A fine sunny, but cool evening. [Rain 0.0 mm; Max 15.2C; Min 8.7C; Grass 5.5C]
20th: With the sky clearing after 06 GMT it was a fine and sunny morning. The temperature at 09 GMT had reached 15.2C, exceeding yesterday's highest temperature. With high 1026 mb to the W over the Atlantic, pressure here was 1023 mb There were a few cumulus clouds during the morning, less of them in the afternoon before some patchy moderately high cloud moved across later in the afternoon. Today's temperature reached 17.0C. Visibility was good with slight earlier haze clearing. After 1800 GMT the sky was mostly cloud covered. [Rain 0.0 mm; Max 17.5C; Min 7.2C; Grass 3.8C]
21st: With just 2 oktas cloud cover at 09 GMT and a light SE'ly breeze the temperature had risen to 17.5C, the maximum of the past 24-h. Scattered mostly moderately high clouds during the day and in the sunshine the temperature reached 23.6C. The evening was bright with weak sunshine as some cloud encroached from the West, this clearing later. {Castlederg 26.5C, Hawarden 23.1C} [Rain 0.0 mm; Max 23.6C; Min 9.2C; Grass 6.4C]
22nd: Overcast with good, but very hazy visibility. Pressure was 1024 mb with high 1026 mb to the S over the Channel. The cloud cleared away slowly during the morning becoming brighter with sunny spells developing. The SW'ly wind force 3 at first strengthened to force 5/6 during the afternoon raising some local dust. Visibility improved to very good and the Carneddau snow-patch could no longer be seen having completely melted on the 21st, a remarkably late date in the current climate. [Rain 0.0 mm; Max 21.4C; Min 11.2C; Grass 9.0C]
23rd: A mostly cloudy morning with some weak sunshine at times and a moderate to fresh S'ly breeze. The afternoon had a little sunshine before turning duller with the wind not moderating. Later turning brighter again with some more weak sunshine during the evening. [Rain 0.0 mm; Max 20.6C; Min 12.5C; Grass 11.3C]
24th: A cloudy start, but hints of something better to come with some breaks appearing by 09 GMT. With less wind today, there was not so much dust and tree debris flying about, the latter more noticeable because of the very dry weather. By afternoon there were sunny spells. At Beaumaris a drilling platform was stationed, work taking up to 3 weeks, to sample the sea bed around the pier. It is intended to return the pier to its former width and strengthen the timber supports. A new landing pontoon will be built and other work to enhance the kiosk and shelter. [Rain 0.0 mm; Max 20.7C; Min 14.0C; Grass 12.7C]
25th: Cloud was increasing before from 3/8 to 5/8 cover by 09 GMT. Soon mostly cloudy here although there were some blue patches to the N. In the West the sky was mostly clear and the day sunny. [Rain 0.0 mm; Max 20.5C; Min 13.2C; Grass 10.8C]
26th: A sunny morning with the temperature at 09 GMT risen to 19.8C (dewpoint 14.0C). There were a few small cumulus clouds to the S together with remnants of expanded contrails. Visibility was very good with a slight haze. The temperature went on to rise to 24.5C, the highest of the month. {Charlwood 28.6C, Hawarden 26.2C} [Rain 0.0 mm; Max 24.5C; Min 11.8 C; Grass 8.2C]
27th: The sky was almost clear at 0530 GMT then clouds developed so that at 09 GMT there were 6 oktas of cumulus and cirrus. Overnight the air temperature had not fallen below 14.6C, highest of the month. The breezy morning (S'ly force 5) soon turning dull with spots of rain at 1145 GMT on and off for about an hour. Afterwards the sky began to clear and it was a mostly sunny and dry afternoon. A clear sunny evening with less wind by 2100 GMT. [Rain trace; Max 22.0C; Min 14.6C; Grass 12.2C]
28th: A bright morning with fair-weather cumulus clouds moving along on the fresh S'ly breeze, some higher altocumulus and cirrus hinting encroachment of a frontal system. The temperature was 18.5C (dewpoint 13.2C). Pressure was 1020 mb with low 1005 N of Scotland with an associated occluded front running down the North Sea. A developing frontal-wave was W of Ireland and looked to be heading our way. It was a mostly sunny morning, but turned cloudier with a freshening f5/6 S'ly wind by noon accompanied by some spots of rain from 1230 GMT, but keeping bright with glimpses of sunshine. By 1500 GMT the low 1025 mb was over Ireland with a warm front over the Irish Sea. The cloud thickened by midafternoon with light rain setting in by 1545 GMT then heavier showery bursts during the evening as, with the low over the Isle of Man, pressure was falling. [Red Wharf Bay 40.4 mm, Pentraeth 39.7 mm, Pentraeth AWS 32.5 mm] [Rain 26.1 mm; Max 20.7C; Min 13.6C; Grass 11.8C]
29th: At midnight pressure had fallen to 1015 mb and at 0045 GMT, associated with an active cold front, there was sudden onset of heavy thunder, 'magnesium flare' white lightning and heavy rain. Thunder and lightning continued locally with very close lightning strikes and with the brilliant white light seemingly inside the house there was a series of loud fizzling discharges about 0120 GMT and the electricity supply failed. Thunder and lightning continued further away to the E until 0150 GMT. We, and a large part of SE Anglesey including Beaumaris where at the Doctor's Surgery the computer system was down and with failure of refrigeration thermally sensitive supplies could have been affected. We were without an electricity supply until 1130 GMT with a further short interruption in the afternoon. I found that electrical surges had rendered 3 electronic telephones and broadband microfilter splitters unusable, so it was out with the antique phones kept for such emergencies. TV, WiFi and equipment on Belkin surge protectors were unscathed except the line connection had failed; I had unplugged my computer system in time. I will put replacement telephones on similar protectors in future! There were reports of similar damage to electronic equipment in the area.
We made coffee for breakfast by boiling water on a gas barbecue, the generator was got ready to run had the electricity supply not been restored (we were once without electricity for 48-h over Christmas during severe gales). The sky was still overcast at 09 GMT, pressure 1019 mb had risen and 26.1 mm of rain had collected in the rain gauge, the most in 24-h this very dry first 6 months of the year! Observer Charles Aron in nearby Pentraeth reported that rain during the storm was torrential and recorded 39.7 mm while Keith Ledson at Red Wharf Bay had 40.4 mm.. Slowly the morning brightened with sunny spells coming along, the afternoon was cloudier, but it was dry. [Rain 0.0 mm; Max 18.8C; Min 13.5C; Grass 13.2C]
30th: A bright morning with 6 oktas cover of mostly cirrus clouds. Pressure was 1019 mb in a transient ridge of high-pressure and the day kept fine and mostly sunny. Lines of orographic convective clouds were present through the day and cumulus persisted in the W over the Snowdonia Mountains; the mountaintops kept clear of cloud until 1900 GMT when cloud descended to 3000 ft. Later as a warm front over the Irish Sea encroached, associated with low 984 mb W of Ireland that was pushing the high-pressure over the North Sea, cloud thickened with slight rain keeping just off the W coasts of Anglesey and Llyn until after midnight. [Rain trace; Max 23.5C; Min 11.2C; Grass 7.6C]
It was the sunniest June since 1975. The 251.7 h of sunshine (142%) and [149%] recorded at RAF Valley was the 3rd highest on the Anglesey record (K&Z adjusted values). Rainfall here was 47.7 mm (75%) and [72%], lowest since 2006, brought rainfall for the first 6 months to 286.4 mm, lowest in Llansadwrn since 1929 (283.7 mm). Temperatures were above average with the mean 15.0C (+0.7) and [+1.4] of average, highest since 2006.
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