GFS Op 00z; The drift of HP northwards and its return southwards for the weekend is confirmed (1025mb Hampshire Sat 23rd). After the BH weekend British weather is increasingly influenced by Erin. After a period of deepening, this morning's output places Erin S of Iceland 970mb Wed 27th, filling and becoming part of the usual eastward movement of Atlantic depressions. (Every day a different output!) Thus mild SW-lies at first becoming a broad trough 1005mb covering Britain Fri 29th, then winds switching into the west or northwest before HP puts in an appearance form the SW Fri 5th.
ECM; keeps Erin on a more southerly track, reaching a point west of Ireland Wed 27th (Every model a different output!), After giving a brief spell of warm S-lies, Erin fills and moves SE-wards to Biscay 990mb Sat 30th with Britain under a trough of LP extending N-wards from there.
GEM; takes Erin NE-wards towards Iceland as per GFS but has it returning while filling to the Bristol Channel 995mb Thu 28th bringing some quite cold air with it, and sticking around there to the 30th.
So on Sat 30th, Erin's remnants are in Iceland, the Bristol Channel or Biscay - take your pick!
AIFS; London, maxima rising to 25C Tue 26th, and dry, then dropping back to a spell around 20C with some rain (but not as much as shown yesterday); Edinburgh, same temp trend but about 4C cooler, small amounts of rain at any time. slightly heavier from Fri 29th.
GEFS; temps mostly near norm, a little cooler at first, a little warmer Tue 26th, a little rain in most runs from 27th, heaviest around Fri 29th and more likely to persist in the north after that
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