MetO rainfall radar predictions much as yesterday with a pulse of heavy rain moving N-wards up the east side of England early Saturday, and then another up the west later. But now Monday joins the unsettled theme with a widespread occurrence of small but intense showers. Small depressions on a stalled front shown on FAX yesterday have been replaced by a significant LP centred Cornwall 993mb Sun 20th, which fills slowly but with troughs hanging around through Monday.
GFS Op 00z - agrees with above, with LP centre on Sun deeper 990mb,moving to the N Sea Wed 23rd with light N-lies following. A brief ridge of HP collapses allowing W-lies through to Mon 28th; HP approaches from the SW but retreats only just about affecting the south. Then a general drop in pressure, with a broad area of LP over Britain or the N Sea until Sat 2nd, not much in the way of windy conditions or localised rainfall but a general tendency to import cool air from the NE.
ECM - similar to GFS; the HP from the SW gets closer 1025mb Brittany Sun 27th but unlike this model yesterday doe not proceed to dictate British weather
AIFS - a big difference from yesterday when it predicted a heatwave (30C+) for the beginning of August in the S. London: a couple of warm days now, then as with other models a dip in temp (max 20C) with rain for the weekend but not specially heavy, then maxima mostly low 20s C but cooler than that at the end of the month, 18C on Wed 30th. Edinburgh: also a couple of warmish (23C) dry days to start, then rain for an extended weekend with maximum temps progressively dropping to 15C by Wed 30th though mainly dry.
GEFS - Widely, briefly warm then mean temp at or slightly below norm to end of month, well supported by ens members with rain quite definite 19th-22nd and cropping up in a number of runs after that as well esp in the N.
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Chichester 12m asl