WX charts for week 1 as previously, cold across the north, from S scandinavia to N Ukraine, with some very cold areas in the far NE, abve norm for most of Europe. Week 2 shows the instability of climate models at the moment; yesterday this was forecast to continue but today the colder (but not freezing) air escapes to cover NW Europe down as far as N Spain. Britain is distinctly colder and the Highlands get their own 'blue blob'. Pptn in week 1 as before, Atlantic - Britain - Baltic, and the previous shift S-wrds on week 2 is still there but further S, Atlantic - Britain - Pyrenees - Adriatic and very heavy in the last two areas.
GFS Op - to start with, much as yesterday with HP to the south and weak troughs making their way across Britain to Fri 16th. The HP then intensifies to cover Britain until Tue 20th, when a dramatic change, a piece of the LP which has been sitting near Greenland breaks off and appears over Britain Wed 21st bringing notably cold air with it (twin centres 975mb Scotland and 970mb S Ireland). After a couple of days re-arranging, this forms Sat 24th into a major area of LP 970mb E Iceland linked to 965mb N Sea with strong N-lies for Britain, persisting to Tue 27th 980mb N Sea and gales all the way down through Biscay. At this date it begins to fill with milder weather approaching from the Atlantic.
ECM - has little of this dramatic development. Wed 21st sees the LP as a shallow trough off W Ireland drifting E-wards across Britain 1005mb Thu 22nd N England with no link to any of the much colder air east of Iceland. Another GFS phantom northerly? Though the northerly is in this case supported by JMA and to a lesser extent by GEM models.
GEFS - mild (very mild in the S)for the next few days, dropping to norm Tue 20th and then to 2 or 3C below norm for the following week, with quite good clustering of ens members throughout. Pptn in various runs at various times, getting more frequent and heavier later. Snow row figures from about Sat 24th range from 7/33 on the S Coast to 14/33 Scotland, greater in the Highlands
Edited by user
13 February 2024 10:30:38
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Reason: Not specified
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