A pool of -5 to -7*C uppers edges westward across Scandinavia on the ECM 12z op run days 8-10... is it having a trial run for those infamous winter teasers?
It arises due to the jet digging down on the eastern flank of the blocking high to our NE. Just the sort of thing ECM tends to get carried away with, hence the aforementioned teasers in winter.
GFS keeps a flatter flow over there, keeping the cold air from spilling down and allowing the block to orientate such as to keep a flow of warm air to our shores - but an often unstable one as Atlantic low pressure moves close to our shores.
UKMO has once again produced more of a mid-Atlantic trough in the jet days 5-6, which means the HP to the east strengthens rather than giving way to a new ridge from the west. It's basically a way of sustaining the warmth from the weekend and potentially building on it further.
I should make clear that when I say 'warmth' I'm talking about the diurnal means (day + night temps combined) and how they relate to the long term average. That could mean something like 8-10*C by night and 22-24*C by day, or 14-15*C by night and 16-19*C by day, or somewhere in between... it all depends on cloud amounts.
So long as the blocking persists, there is the potential for it to either keep us high and dry for another fortnight, or place us at the mercy of stalled weather fronts and bucket-loads of rain, should the blocking position a bit too far east to keep the storms away.
Unless the jet weakens, allowing for occasional sliding lows crossing the UK, there isn't much room for something in between.
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T-Max: 30.2°C 9th Sep (...!) | T-Min: -7.1°C 22nd & 23rd Jan | Wettest Day: 25.9mm 2nd Nov | Ice Days: 1 (2nd Dec -1.3°C in freezing fog)
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