The westerly breeze was gusty on Thursday, reaching 20mph on occasions, but continued the flow of mild air such that the thermometer rose to 12.4C being 2.2C above the average. It was another totally dry day and night, only the fifth this month. The past night was also mild with a low of 7.6C, which was 3.7C above the 39-year average.
Friday dawned dull with the wind that had begun to veer into the westnorthwest now coming briskly from the northwest. The high pressure, now currently elongated in shape, reaches from Spain to Iceland that combined with a low pressure system to the east, will feed a northerly flow of much cooler air, originating near the Arctic, as the day progresses. This is because air around an anticyclone rotates clockwise and the reverse for a depression. As result it will be a much cooler day with windchill in evidence making it feel even cooler than that indicated on the thermometer. The air is now much drier, the humidity at 08.00 read 83%, the lowest humidity since 25th August.
The much cooler air and clearer skies later could well produce an air first overnight, which will be the first for a month.
