The online Met Office forecast I saw on Sunday had, for Tue, maxes of 26*C for Bristol and 25*C for Birmingham, despite also showing extensive cloud cover.
It really puzzles me that such high numbers were ever forecast for those areas.
For today, their map showed 29*C for London, 26*C for Southampton and Bristol, 24*C for Birmingham, and 22*C for Norwich. This being despite also showing the northeast winds across England.
If the cloud breaks up in the far south as the upper level heat edges in, and downwind of high ground to the north of there, I can see the Southampton, Bristol and maybe Birmingham numbers being close to the mark.
For London, it's going to take a clearance of cloud by early afternoon and then some exceptional vertical mixing to sufficiently disrupt the flow off the North Sea for temps to hit the high 20s. Not ruling it out but it seems like a long shot!
Norwich reaching 22*C would also be surprising; even if models are breaking up the cloud much too slowly, there's not much of a land fetch across which vertical mixing can disrupt the flow off the North Sea.
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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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