Today sees the beginning of a change in the weather pattern as a low pressure system, that is centred on the northern edge of the UK, will begin to influence the weather in the UK.
Today will see a steady decline in the surface air pressure although the risk of any precipitation today is only around 10%. What will be noticeable is an increase in wind speed over the next few days. This will be particularly a factor over the Christmas weekend when we will see average wind speeds of around 12-15mph.
Today will see the breeze increase in speed as the day passes. By late afternoon the SE breeze will average speeds of around 8mph.
It will also, during the daylight hours, be a cloudy day. This cloud will restrict our top temperature to around 6c. Our overnight low will be around 5c. With both figures the wind chill will reduce the “feel” of the actual air temperature by a couple of degrees.
If you are a betting person then don’t waste your money on it being a white christmas in our area. Along with the breeze that I previously outlined will be a warm SW-WSW breeze and a top temperature of around 5-6c. This is very similar to today and yesterday.
Summary : A cloudy day. A decrease in surface air pressure will increase wind speeds as the day passes.
Observations made on 20/12/2016 at 06:30 hours Hammerwich, Staffordshire.
Temperature : 4.2c; Air pressure : 1021.4mb; Relative humidity 90%; Wind calm; Rain this month : 13.2mm; Rain this year : 710.6mm
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Surface pressure chart showing closely spaced isobars on Christmas day. (The closer the spacing the greater the wind strength).