Gloom and drizzle return on Wednesday

Wednesday saw the anticyclonic gloom arrive with the fog and mist from low cloud taking until almost noon to lift. The intense high-pressure is beginning to slip away allowing moist, warm air from the Atlantic to circulate clockwise around it as the very light breeze, maximum gust of 11mph, veered into the north east.The drizzle produced 0.4mm of precipitation.

The maximum of 7.4C (+0.4C) was just above the January average whilst the warmer air under the cloud cover meant a frost free night with a minimum of 3.4C (+2.3C). Sadly no sunshine after the previous glorious days.

Thursday saw the thick cloud persisting but the cloud base was a little higher.

Five hours of sunshine on Tuesday and the UV level rises

After the mist had cleared on Tuesday morning the sun came out for 5.3 hours and the UV level, at 0.8, was the highest since the beginning of December.

The intense anticyclone edged a little westwards but still dominated our weather, not only dry and sunny but for many hours the anemometer remained stationary with one maximum gust of just 5mph.

During Tuesday evening the thermometer initially went below zero at 18.55, for almost four hours, but as cloud encroached the temperature recovered above freezing at 22.52.

Wednesday morning saw thick fog replacing the blue skies with visibility reduced to 100m as thick cloud and moist air had drifted. The air is circulating around the high pressure bringing moist and warmer air from the Atlantic.

The maximum on Tuesday was 6.6C, just below average, whereas initially the thermometer dropped to -1.2C around 21.00 last night before recovering to 3.4C at 08.00 on Wednesday.

Coldest night this winter

The clear blue skies and sunshine (4.8 hours) on Monday continued under the influence of the intense high pressure. The daytime temperature slowly rose just above average with a maximum of 7.4C but there followed the coldest night of the winter with a minimum of -3.7C just before dawn on Tuesday under clear skies as there was no duvet of cloud to minimise the loss of residual warmth into the atmosphere.

The calm conditions continued with hours of calm and a maximum lone gust of 10mph. The UV level was again giving a peak of 0.7, the highest this month

Dawn on Tuesday saw variable fog combined with the hard frost but there was evidence of the sun trying to break through.

Highest barometric pressure since station began in 1984

The barometer edged higher again on Sunday as the centre of the anticyclone drifted closer to the UK, just off the Cornish coast, with a maximum of 1049.6mb at 00.17 early Monday morning. This was the highest pressure since my station began in 1984 and close to the UK record of 1053.6mb set in 1902.

The temperatures were depressed due to the air mass coming from the north west but very little movement, a peak of just 9mph was recorded. The maximum of 5.8C was 1.2C below average and another air frost occurred overnight with a minimum of -2.7C being 3.8C below the 35-year average.

Monday arrived with broken cloud and still wind conditions.

We have now had two consecutive days without rain, the first this month, and with the barometric pressure maintaining its strength there are likely to be more dry days this week.

Highest barometric pressure for a year

Saturday saw the barometer begin the steady rise in pressure resulting in a dry and sunny day with 4.9 hours of sunshine, the sunniest day since 25th December. The high pressure also meant a very calm day with a maximum gist of 10mph from the NW but often the air was very still.

The barometric pressure has overnight been rising strongly with a reading of 1043.7mb at 08.00 on Sunday. This is the highest pressure since 4th January 2019 and is still rising rapidly. The highest recorded pressure in the UK was 1053mb in 1902. At midnight the centre of the high pressure was over south west Ireland at 1041mb and is forecast to be over the Gower Peninsula at midday today having built to 1047mb. By midnight tonight the centre of the anticyclone is forecast to be over the Bristol region reaching a probable peak of 1048mb.

The clear skies and little air movement meant a cool day and cold night. The thermometer struggled to reach a maximum of 5.8C, which was 1.2C below the 35-year average and inevitably under clear skies overnight, an air frost occurred with the thermometer dipping to -2.7C at 08.00 in Sunday.

Sunday dawned with clear skies although a little mist was meandering over the downs at 08.15. The thermometer will continue to drop a little further until the sun rises and increases in strength.

Update at 09.00: the thermometer had fallen further to -3.1C and the barometric pressure risen to 1044.6mb

Update at 17.30: the barometric pressure is currently 1047.8mb, the highest I have recorded since January 2002. The thermometer is falling steadily, currently 1.9C after a maximum of 5.8C.