The weather is on the change!

The thermometer rose to 30.1C on Thursday being 7.4C above average but 1C lower than the previous four days when 31+C was reached. It was the ninth continuously dry day.

The wind continued from the northeast but just a little stronger with a peak gust of 12mph.

The past night was a little cooler that saw the thermometer drop to 13.1C. However, this was still 1.3C above average and the coolest night since the 18th.

The centre of the anticyclone has been leaving us and is now located off the coast of Norway. This is causing the wind direction to veer into the east on Friday and freshen. The barometric pressure has been slowly falling since Thursday and currently at 08.00 read 1018.8mb, a drop of 5mb in 24 hours.

Weak sunshine initially greeted the arrival of Friday as there was variable cloud and a significant breeze from the east. The thermometer at 08.00 read 17.6C making it the coolest start to a day since the 16th.

Very warm night

Yet again on Wednesday the thermometer rose very high to 31.0C at 16.05. This was 8.3C above average and the fourth consecutive day with maxima at 31C or just above.

We have now enjoyed eight consecutive dry days. The rainfall total for July stands at 32.0mm whilst over 4mm of equivalent rainfall has been evaporating into the atmosphere every day for the last six days. The total evaporation from ground sources and plant life has risen to the equivalent rainfall of 64mm.

It was a very warm night with the thermometer not sinking below 14.6C, which was 2.8C above average.

Thursday arrived with radiation mist first thing but the sun shining from dawn began to dissipate the moisture rapidly so that by 07.00 it had disappeared and by 08.00 the thermometer read 21.1C.

Update at 18.00: maximum only reached 30C today rather than 31+C on four previous days

High pressure builds

The maximum temperature for the past three days has been very similar with 31.7C, 31.4C and 31.6C on Tuesday, all last C above the 37-year average. We survived 11.60 hours of very strong sunshine, Tuesday was 11.55 hours, with the UV level not surprisingly well into the Very High level for three hours around midday.

The past night was a little cooler but still above average with a minimum of 13.6C.

Wednesday arrived as the three previous mornings with sunshine from dawn, a little weaker than Tuesday due to thin high cloud, that lifted the thermometer to 21.3C at 08.00, a degree down on Tuesday at that time.

The centre of the anticyclone is currently off the north west coast of Scotland with the pressure rising further, with a pressure of 1022.7mb at 08.00. The air movement, cannot call it wind with maximum gusts only in low single figures, has veered into the northeast as the high pressure relocates.

The hot, dry weather is causing the equivalent rainfall of almost 5mm daily to evaporate into the atmosphere from the ground and plant life.

Update at 16.15: maximum temperature of 31.0C (88F) at 13.01, just below peak of previous days. Now four consecutive days of 31C maximum or fractionally above.

Settled weather continues

The anticyclone continued to bring hot, sunny weather on Monday with 11.6 hours of sunshine and very High UV levels. The thermometer did not quite reach as high as on Sunday with a peak of 31.4C being 8.7C above the average.

The Meteorological Office yesterday broadcast their first Extreme Heat warning that lasts until Thursday evening. This is not only due to the high daytime temperatures but also the very warm nights. The past night saw the thermometer not fall below 14.2C, which was 2.3C above the average.

The ground temperature at a depth of 5cm read 24.0C at 08.00 as limited warmth radiates into the atmosphere overnight.

Strong sunshine welcomed the arrival of Tuesday that pushed the thermometer to 22.9C at 08.00.

Another feature of recent days, under the influence of the high pressure, are the very calm days with little movement of air. At head height the last two days have seen a maximum air movement of just 8mph and 9mph with frequent periods of total calm.

Update at 19.00: thermometer eased upwards again with a maximum of 31.6C (89F) at 14.29.

Equal hottest part of country on Sunday! Heathrow 31.6C, Marlborough 31.7C

Although the sunshine hours of 11.8 were slightly down on Saturday the residual heat from a warm night saw the thermometer on Sunday rise to 31.7C, which was 9C above the 37-year average and the hottest day since 12th August 2020 (34.1C). It was also equal to the hottest part of the country. The UV level again rose to Very High. My station is on the northern edge of Marlborough and sited up the garden away from concrete and buildings.

The breeze was very light on Sunday with a maximum movement, cannot call it a gust, of just 8mph. For long periods the anemometer was becalmed but when it did move the air movement came from many compass directions so described as variable.

The temperature overnight was very high with a minimum of 14.0C being 2.2C above average.

Monday again saw strong sunshine after dawn that propelled the temperature to 23.1C at 0800 so at that time was already above the average maximum for July of 22.7C. After five consecutive dry days and intense sunshine the humidity level at 0800 read 74%, the lowest since early June when we had similar hot weather.

Update at 10.00: temperature of 28.3C and rising steadily

Update at 20.00: peak temperature of 31.4C at 15.39