The boundary between the exceptionally 'warm' and seasonably chilly air on Thursday has been trending a little south over the past 48 hours, the result being that the heaviest rain looks to start off across southern parts of Wales and extending NE from there, but drift down across southern England over the following 9 hours. This limits the extremity of the rain totals for the former region, but locations within still look to be hit hardest. Meanwhile the far south may see temps as high as 15*C for a time ahead of the rain.
The frontal boundary may stall and develop a second wave across the far south on Friday, though the rain doesn't look anywhere near as heavy as it does wrt the first wave.
Further ahead in time, Saturday continues to look rough for the northern half of the country in an unwelcome repeat of last weekend. Soon after, the south will need to watch out for a shortwave low coming in from the WSW which looks like it may peak in intensity close to or over the middle of the UK, the strongest winds affecting the southern half.
It looked nasty on the ECM 00z op run and the GFS 06z op run has managed to mimic that outcome closely enough to give some sense of what wind gusts are possible. Below is early Saturday on the left, and the (noon Sunday) peak of the shortwave low's impacts on the right:
Plenty of rain around too, hitting the west hardest - though I suspect GFS is tapering off the totals too quickly when looking east from there. We can also see the area hit hardest by Thursday's rain:
Bear in mind that's the 5 day total so doesn't include Sunday's event for the south, for example.
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T-Max: 30.2°C 9th Sep (...!) | T-Min: -7.1°C 22nd & 23rd Jan | Wettest Day: 25.9mm 2nd Nov | Ice Days: 1 (2nd Dec -1.3°C in freezing fog)
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