GFS has now come out quite bullish about HP being established over the UK from about the 22nd onwards. It's a fairly small HP cell, so its position is critical, and it wanders around a bit, first giving warm SEly (see previous post) and later cool NWly. GEFS ens show (mostly) a general uptick in temps for that period, along with a general decrease in rainfall, though you can find occasional local examples with exceptions to rainfall totals.
for ECM, this is the very end of its run, and it's less positive with HP flatlining to the south of the UK
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Chichester 12m asl