FAX - slack HP drifting SW-wards and allowing fronts to affect NW Scotland to day, but moving back to N Sea off E Scotland 1032mb Wed 29th with E-lies through the Channel and a front lying across N France threatening Cornwall.
GFS Op 0z - the HP above spreads out and weakens. Change comes on Tue 5th with a trough moving across Scotland to Scandinavia with strong N-lies for the east side of Britain Thu 7th. As this system fills, HP nudges towards Ireland from the west, still N-ly regime but lighter and not directly from the Arctic Mon 11th. No sign of significant rain anywhere.
ECM - like GFS but the 'weakens' prediction is more noticeable with Britain in a shallow col for the BH weekend. The col develops into a shallow trough moving slowly eastwards, much as GFS, but importing the cold air more from the NE and winds less strong.
AIFS - London, maxima 20 C to Tue 28th, dipping for a day or two before back to 20C Fri 1st; then progressive decline to 13C Sat 9th, with rain - only a little at first but measurable by the 9th. Edinburgh, maxima variable 12-15C to Sun 3rd, then settling to 10-12C; traces of rain from Fri 1st and quite a lot on Fri 8th
GEFS - mean temp above norm now and from Thu 30th to Tue 5th, then below norm, with moderately good ens agreement. Maybe some very small amounts of rain in the coming week, but rather more likely from Tue 5th, still not particularly heavy.
So maybe the fine weather will just about hang on for the BH weekend, extended by a day or so; good spring weather now but in the long term looking cool with no real sign of summer
Originally Posted by: DEW