FAX - to start with, some weak fronts crossing Britain, cooler with W-ly winds. LP gets organised 997mb SW of Iceland Mon 17th and moves to North Sea by Thu 20th, switching winds to the north and bringing active fronts possibly as far south as the Channel from late Tue 18th.
GFS Op 00z - following on from FAX, pressure rises W of Ireland and slowly moves eastwards, taking over from the LP and covering Britain 1025mb Wed 26th with return of warmth from the Continent. There is then a contest between HP which tries to establish a ridge from the Atlantic to Denmark and LP which tries to split the ridge into two as it pushes north from France. After some to-ing and fro-ing Britain finishes in a col, with LP 1010mb Normandy.
ECM - like GFS at first but fails to develop the HP area and on Wed 26th Britain is in a shallow trough stretching from Iceland to Spain. GFS offers a new heatwave lasting several days but on ECM it's only a one-day event.
AIFS - London, maxima falling to 18C by Sat 22nd, rising to 22C before falling again Sat 29th. Small amounts of rain this week, heavier Thu 20th, and then more Thu 27th and Sat 29th (Bank Holiday weekend alert!). Edinburgh, similar temp profile as for London but about 3C cooler; some rain this week but a lot from Thu 27th to Sat 29th (about 50mm non-stop over the two days).
GEFS - England, mean temp with good ens support soon dropping to norm or a little below through to Tue 1st (though op takes off towards hot at the end). Rain possible on any day but no consistent forecast as to when (perhaps more likely in SW around Thu 27th). Scotland, similar, but temp 'definitely' rather than 'a little' below norm in the next week; rain more likely than for England and certainly heavy in the west.
No sign of any ex-hurricane arriving to break up the nondescript pressure pattern for the Atlantic. Indeed, NHC has this morning written out a couple of potential disturbances and declared no activity on the Atlantic for the next 7 days.
I can calculate the movements of stars, but not the madness of men - Isaac Newton
Chichester 12m asl