Subtle changes from recently - and a little more divergence after this weekend.
Each of GFS, ECM and GEM stick with the initial phase of high pressure building in over the UK from the west, then a low to move over the top of if, causing it to decline as we start next week.
Whereas previously the models had aligned to have that low then sinking broadly SSE'wards down the North Sea, all now show rising pressure over Central Europe, which blocks this southwards route for the big low and keeps it bottled generally to the NNE/NE of the UK.
GFS spins an active front south over the UK through the middle of next week, but then quite quickly fills the low, causing it to fragment into a messy picture from Iceland to Scandinavia (wet over Scotland, drier as you move south under a flabby ridge). It then builds the retreated high back in over the UK from the SW as we hit next weekend. Into FI and, after briefly sitting over the UK, the high then links northwards with a ridging Greenland High. A low well to our north severs that link and a resultant weak high over the UK is soon toppled SE'wards by a new train of Atlantic lows
ECM keeps the influence of the initial high over the UK for an extra day, but then has the low much more active and persistent, sitting just north of/over Shetland. The whole of the UK is unsettled through the middle of the week. All the while, the high sits in the mid-North Atlantic to our west and eventually drifts back eastwards. Right at the end of the run it makes it back over the UK - but there's a nasty low with a huge front stretching S from Greenland to level with Southern Spain waiting to hit us.
GEM also keeps the low intact, but meanders it around the Norwegian Sea, so it's [wet] influence on the UK waxes and wanes through next week. GEM then, unhelpfully, spawns a little low over France and migrates it northwards in time for next weekend. It dissipates pretty quickly, leaving most of the UK more under the influence of the high camped off the SW tip of Ireland.
Martin
Home: St Helens (26m asl) Work: Manchester (75m asl)
A TWO addict since 14/12/01
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