VillagePlank
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SE & East Anglia Regional Weather Discussion 23/04/2017 onwards
VillagePlank replied to Captain Shortwave's topic in Regional
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SE & East Anglia Regional Weather Discussion 23/04/2017 onwards
VillagePlank replied to Captain Shortwave's topic in Regional
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SE & East Anglia Regional Weather Discussion 23/04/2017 onwards
VillagePlank replied to Captain Shortwave's topic in Regional
Oh dear .... it could well be that the t/storms will happen north and east of you, which will be very frustrating as it's still likely you'll see the cells as rain as they pass overhead. -
SE & East Anglia Regional Weather Discussion 23/04/2017 onwards
VillagePlank replied to Captain Shortwave's topic in Regional
Is that for today *and* tomorrow? The forecast is for late evening early morning, not ten minutes time!! -
SE & East Anglia Regional Weather Discussion 23/04/2017 onwards
VillagePlank replied to Captain Shortwave's topic in Regional
Locations are right up in the air, right now (and so is timing) given the long time it has taken for the detritus to clear this morning. That excessive precipitation blob was/is forecast to travel up the channel by other weather models, sadly. I think we'll know locations better (but not perfectly) once the shortwave has entered the channel, and, of course, it is likely to enter the channel as rain turning to the thunderstorms as it embarks. -
SE & East Anglia Regional Weather Discussion 23/04/2017 onwards
VillagePlank replied to Captain Shortwave's topic in Regional
Today's chances are determined by the theta-w plume. Outside the darkest area on the maps, it looks like rain, but inside these regions, the potential for thunderstorms is there - often thunderstorms happen on the leading edge. So for far SE area, we are looking at late evening early morning. Of course, in the real world, Mother Nature often has other idea re timing, and locations ... -
Possibly. However, this is what the Met Office said: "There is a risk of more severe thunderstorms breaking out over parts of the Midlands, northern England and north Wales from late Wednesday afternoon onwards into Wednesday night, leading to torrential downpours, frequent lightning, very large hail and strong gusts of wind." Now, I might be getting on a bit, but, I'm pretty sure I read that right.
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That's only part of the story: the main initiation is this trough breaking through from the West clearing the cap. Once that's done, all the bits and pieces should be in place. A good sign is the speed this thing is travelling through; most models put it a lot slower, and thus the risk of nothing happening (too late in the day) was a real possibility. It think it's looking very positive at the moment.
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SE & East Anglia Regional Weather Discussion 23/04/2017 onwards
VillagePlank replied to Captain Shortwave's topic in Regional
Here's the skew-t for now, for Heathrow, from the GFS-6z I know that everyone else is forecasting no precipitation let alone storms, but I gotta say, I'd say there's an outside chance between now and 6pm of something developing if and only if that CIN really has reduced to zero -
If you look at the high theta-e values (last one at 6pm) in my previous post, and compare that to the high theta-w values in this one, where they overlap is the most likely place to observe thunderstorms this evening. Possibility of an outside chance of Isle of Wight seeing some action, too, but a low probability nevertheless, and you can see the reason why the MetO are suggesting more action tomorrow for SW England.
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Here's what the West Midlands is waiting for: Note the ridge of high theta-e air moving in from the Irish Sea. Theta-e has some interesting properties so that a ridge of it (like shown above) can (and often does) show the area in situations like today where a convection burst is likely, and, in any case, high values tend to mean very high levels of instability