Credit to ECM for picking up the northerly at this time yesterday, while on GFS it was no more than a hint of what is now predicted, though curiously it is now GFS most keenly promoting it.
16-dayer: still that bulge of cold air holding over W Europe (the 'blues' are even back over the Alps in week 2; fresh powder skiing if it wasn't for Covid!) while serious heat ramps up E of the Black Sea and advecting N-wards. Those looking for serious warmth in the Med will be disappointed but Portugal, esp in the S, offers a chance of hot weather. Rain over UK and NW Europe in week 1 moves into C Europe week 2, but still not completely drying up here, contrary to earlier dry forecasts.
GFS: continues with the theme of LPs crossing the UK implying damp and showery weather, and aligning themselves to draw down N-lies repeatedly on the back edge (though not as dramatic as some of the posts above) but disappointingly not to bring up any warm air on the leading edge. The following centres are noted with the common theme as above; Sun 16th 995mb S Ireland; Fri 21st 1000mb E Anglia (this one sticks around and brings a steady N-ly with the help of C Atlantic HP); Thu 27th 1000 mb E Scotland. No sign of HP across the UK as shown yesterday which got our optimists' juices flowing.
GEFS: continuing below norm throughout, with only a few runs breaking ranks and showing improvement after Sat 29th. Typically 2-6C below in S (coolest around Tue 25th and this includes op & control, perhaps as much as 10C below on E coast!), less extreme in Scotland, closer to but not above norm for the most part, and the cold patch 'only' 3-4C below norm at that date. A showery pattern of rain persists, if anything most showers around Fri 21st, fewer later on.
ECM: follows GFS though LPs are less well defined, and pressure is just generally low continuously
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Chichester 12m asl