BBC monthly outlook
Summary
An unsettled month with variable temperatures.
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Wednesday 20 January – Sunday 24 January
Stormy midweek with a colder weekend ahead.
The low pressure centre of Storm Christoph will move into the UK from the southwest on Wednesday afternoon. There will be bands of heavy rain for most of the day for England and Wales bringing a risk of further flooding. Scotland will start out mostly dry, but heavy snow bands will push into southern areas in the afternoon. Snow will mostly stay above 100m, but may occasionally fall lower than this. However, the warm front from Christoph will also bring in some mild air, with highs into double figure for some in southern England and Wales.
By Thursday, morning Storm Christoph will have tracked northwest through England and be sitting just east of Edinburgh. Heavy snow will persist through much of Thursday for Scotland. Again, most of the heavy snow accumulation will be above 100m, but wet snow may reach sea level in places. Strong winds will spread through eastern areas of England, but elsewhere in the county it will be a mostly sunny. Western coastal areas will have windy day with a few sharp showers.
From Friday and into the weekend, as Storm Christoph moves away to the northeast and fills, a northerly wind will bring some colder air from the North Atlantic.This will bring temperatures back down to near or below average. Some weak low pressure centres will keep things unsettled, cloudy, and feeling cold through the weekend, but strong winds and heavy rain are not expected.
Monday 25 January – Sunday 31 January
Turning wetter and milder with some cold snaps.
For the rest of January, a high pressure system building in strong over Greenland will play a major role in our weather pattern here in the UK. This is because the jet stream is being pushed further south in the Atlantic by this high. This more southward track of low pressure systems will allow them to pick up some milder sub-tropical air from the Atlantic and drag it into western Europe. This will be behind warm fronts, the first of which is likely to arrive on Monday 25th. This weather pattern is likely to persist through the week, so we will see low pressure systems bring milder air from the west and southwest along with plenty of rain and some stronger winds.
Between these lows there will be a few days of some sharp cold and dry weather as a brisk northerly wind develops. There is still some uncertainty on the exact timings of the frontal systems, but in general we can expect one every 2-4 days. As the next fronts move in over the colder air, there will be risks of some wintry weather for some areas, mainly the north.
Snow or freezing rain is possible, even to low levels at times. So, while a repeat of 2018's Beast of the East does not appear likely, that doesn't mean we will escape any potentially disruptive wintry weather.
Monday 1 February – Sunday 14 February
Staying unsettled and increasingly milder.
By early February, the high pressure system in Greenland is expected to begin to ease, but it will certainty take its time doing it. As it slowly weakens, lows will be able to move into Northwest Europe more freely, bringing some longer-lived mild spells associated with warm fronts. Between the low pressure systems, cold snaps are still likely, but will become increasingly shorter-lived. The temperature is likely to still be very changeable, shifting from a few degrees above average in the mild spells to several degrees below average in the cold snaps with some sharp frosts likely. Again, as with late January, some wintry weather is possible as fronts move in over the top of the colder air.
There are some signals that by mid-February it may tend to be milder most of the time.This will ease the risk for wintry weather (at least for everywhere but the Scottish Highlands!). However, there remains a significant risk that more prolonged cold could develop into mid-February, which would be caused by stronger high pressure to the north. Confidence is therefore very low at this range as computer model forecast skill as been very poor in recent days.
There is a high risk for more prolonged cold to develop into mid-February, which would be caused by stronger high pressure to the north. This would also be a drier pattern for the UK as the Atlantic low pressure systems mainly track south of us and head into France, Spain, and Portugal.
Further ahead
We will continue to monitor the Greenland high and try to pin down when the changeable and unsettled pattern will end, but after all, this is still Britain in winter.
https://www.bbc.co.uk/weather/outlook