Truly a zombie summer (as someone has already christened it); each time a heat wave is forecast to decay it pops up again, as strongly as ever. Two days ago, and yesterday (when I looked but didn't have time to comment) cooler patches on the WX summaries were appearing in W Europe and some cool/cold air was approaching from the NE; and Britain was forecast to have plenty of rain.
Now (at least for these GFS based charts; but see Dr mog's ECM take above) the heat is back for the next two weeks across W Europe and quite far N in Britain; there's a heat bulge up to Finland in week 1 and although this flattens out in week 2, the higher temps press on into Russia. Rain is patchy, here and there in week 1, but in week 2 as has so often been the case banished to the far north, plus a bit over the Alps, and a very dry area developing along the coastal countries of W Europe.
GFS Op: pressure generally high for Britain today but that long-forecast shallow LP drifts NE from Brittany to the N Sea by Wed 17th, after which pressure ridges back in from the SW, not altogether convincingly as occasional LPs move past NW Scotland and LP over France is from time to time more active. The final chart for Mon 29th (a BH of course) shows a general drop in pressure as these two elements get together
GEFS: temps back down to norm for week beginning Wed 17th with a reasonable amount of rain in most ens members, but for the week following, back to warm and dry in the S while for Scotland esp the NW the mean temp in this week stays near norm and the rain continues in significant amounts.
ECM: makes rather more of the LP at the beginning of next week, and then later on emphasises the Atlantic LP with NW-lies on many days esp Mon 22nd with LP 995mb Rockall and trough to SE affecting all of Britain
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Chichester 12m asl