Yes, I've a bit of a reverse Moomin feeling about all this... that bubble of >20C 850s is looming large. There's also an ominous looking low to the west of Iberia, the classic "heat pump" scenario.
The wetter weather we'll enjoy this week is all part of it, of course. At the moment we're to the north of the jet, as we have been for some weeks now. That's very unusual at this time of year (the textbooks say the jet should be between Iceland and Scotland). Note that even on the cold side of the jet, with persistent NE'lies, we're still far above average this month... and we've set several daily CET records, in fact.
The jet is now working its way north, meaning the belt of rain which has lain to our south over the past few weeks is making its way north. The models show the jet assuming its textbook position by the end of the month.
That opens the gates to plumes and the rest, meaning we'll need a bit of luck if we're to avoid widespread spells of 30C+ again this year. I don't expect the jet will retreat southwards again any time soon!
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Originally Posted by: Retron