UK Weather: Stop the Lows, we have an intense High, near 1050 hPa and weekend sunshine!

17th January 2020 09:17

UK Weather: Stop the Lows, we have an intense High, near 1050 hPa and weekend sunshine!

Friday will be a day with clusters of showers and sunny spells. After a mild start in the SE, it will turn cooler and this weekend will see cold, frosty nights. Quite a change. Another difference will be that pressure is rising and so the weather will settle down. It will be dry and sunny, with lighter winds. Fine for getting out just chilly first thing but then it is January.

Atmospheric Pressure is now measured in hPa, hectoPascal. 1 hPa = 1 mBar, one milliBar.

Pressure chart UK Atlantic 1050 mb hPa near

There are distinct groups and bands of showers today. One area of low pressure will pull away from northern Scotland where there are severe gales this morning. One line of rain and hill snow showers will move SE across the Great Glen towards Glasgow by lunchtime, reaching Northern Ireland as well. You can see this on the radar image over NW Scotland.

Rain radar over UK low pressure to north

There is another area of rain over Wales and northern England. This moves eastwards this morning but also eases slightly. There will be wintriness over the highest peaks inland but not much. Through the afternoon the showers reach eastern England and later East Anglia with some heavier downpours likely. More showers also appear for SW Britain during Friday afternoon brought in the westerly flow.

This morning temperatures in SE Britain are in double figures with a SW breeze. Cooler air creeps eastwards with many places having afternoon temperatures of 6 or 7C.

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UK weather Friday 17th Jan

This evening showers continue for Devon and Cornwall, across the Chanel Islands and a scattering still for NW Britain. Again, snow over Scottish hills and the Peak District but the showers come and go. High pressure begins to build, and an incoming Atlantic low is diverted south towards Iberia, bringing unsettled weather to Spain and Portugal and then the western Mediterranean this weekend.

It will be blustery for the far north of Scotland with showers from the NW, but for most of the UK, there will be light winds overnight, clear skies and temperatures falling to just below zero with a frost.

Saturday looks fine and sunny. Temperatures of 4 to 7C, not bad where the winds are very light and in the sunshine.

Cold again for Saturday night with a frost with clear skies and hardly any wind.

Jet stream UK Atlantic

A huge winter storm is coming out of NE US on Friday and will head up towards Greenland and Iceland at the weekend. It’s enough of a synoptic feature to help buckle the jet stream. So rather than a zonal jet coming right across the Atlantic firing low pressure after low at the UK, we get a change finally.

ECMWF model high near 1050 mb

After a wet and windy week with Storm Brendan unusually high pressure builds over the UK. Nearly 1050hPa (mBar). The all-time record is 1053.6 for the British Isles, set in Aberdeen 31 January 1902. We don’t often see over 1050 hPa here in the UK so watch your barometers at the end of this weekend.

Super Ensembles Netweather Extra

The GFS is backed off slightly from 1050 for SW Britain seen in yesterday’s run above but still, it will be an intense high. The high holds on into next week bringing more dry weather and frosts, particularly for England and Wales. There will be more cloud and a westerly breeze further north.

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