Windrush Weather

Author: Eric Gilbert

  • Very mild airstream

    The anticyclone centred over France, and slowly moving eastwards, continued on Saturday the southwesterly airstream that brought the very mild air. The thermometer rose to a maximum of 10.6C being 2.6C above the average bur dropped very little overnight, to minimum of 8.6C at 08.00 Sunday.

    Sunday, as previous days under the moist airstream, arrived dull and overcast. The barometric pressure has fallen from its very high reading of 1040.8mb yesterday to 1034.7mb today as the anticyclone eases away. We have had eight days this month with no UV value registered, which is a little above the December average.

  • Anticyclone builds

    The anticyclone now over France continued to feed moist, warm for over the country on Friday on a very light southwesterly that saw the thermometer, during daylight hours, climb just above average (+0.9C) with a maximum of 8.8C. During the night the warmth continued to build with the thermometer reaching 9.4C by 08.00 Saturday making it equal warmest start to a day this month.

    Saturday once again brought us a dull and dark start to the new day. The barometric pressure read 1040.0mb at 08.00, the highest since 6th February. The very quiet air movement from the southwest will continue.

  • Highest barometric pressure for 10 months

    Thursday was another grey and dull day with drizzle in the morning amounting to 0.4mm. That took the monthly total to 70.3mm when the 39-year average is 92.7mm.

    The temperature eased up a little from the previous cold day, thanks to the very light southwesterly air movement, with a maximum of 8.6C at 14.40 being 0.6C above the average. The evening saw the thermometer slowly descend but more quickly after 02.00 as broken cloud appeared allowing the temperature to drop to its lowest at 07.56 Friday with a minimum of 2.3C, which was exactly average for December.

    Friday arrived with broken cloud that soon filled in. The significant feature of today is that the barometric pressure has been rising significantly again over the last twenty-four hours with a reading of 1036.3mb at 08.00, which was the highest pressure since 4th February (1038.1mb). This is due to a large anticyclone centred over the Bay of Biscay, current pressure reading of 1041mb, which is throwing a ridge of high pressure over the UK.

  • Temperature recovered in the early hours

    The north then northwest airstream on Tuesday meant a cold day being 4C to 5C down on previous days with a maximum of just 6.9C. That low temperature was 1.0C below the 39-year average and combined with the strong wind gusting to 27mph at times produced a wind chill that meant outside if felt more like 4C than 7C.

    During the evening the temperature slowly began to fall away, quicker after midnight, to reach a minimum of 0.6C at 02.31. However, another weather front then began to cross our area bringing thick cloud and light rain or drizzle, amounting to just 0.4mm, that reversed the temperature drop so that by 08.00 the thermometer read 3.4C.

    Thursday didn’t really dawn as it was so dark and dull under the very low, thick cloud producing light drizzle. The barometric pressure has been rising with an increase of 20mb in the past twenty-four hours so eventually today will tend to become drier and brighter. This is due to an anticyclone building in the eastern Atlantic throwing a ridge of high pressure over the UK. The other significant feature is that the wind in the early hours backed from northwest to southwest, later will veer into the west, this wind direction means moist, milder air so the temperature should slowly recover during the day.

  • Temperatures edging downwards

    The peak of 10.7C on Tuesday, thanks to heavy cloud and showery conditions that added 4.3mm of rainfall. Thus was still 2.7C above the long-term average but the lowest for four days. The minimum overnight occurred on Wednesday at 08.00 with a low of 6.9C being 4.6C above the average.

    The maximum temperatures have been slowly dropping over the last four days as we begin to lose the influence of the warm, moist Atlantic air with 12.3C, 11.7C, 11.0C and 10.7C respectively. Wednesday will see this trend continue. The recent depression is slowly edging eastwards over the Continent as a result the wind has already veered from the southwest to northwest and later today will come from the north. This is a cooler airflow so the maximum today will be down on those of the last four days, probably a single figure.

    Wednesday arrived dull and dark with total cloud cover and feeling cooler in the nor-norwest airstream.