Thunderstorms show up late

Courtesy of UKMO

I did wonder if yesterday evening’s thunderstorms that spread northwest across the heart of central England were ever going to materialise, but they finally make it across northwest England at around 19 UTC. It’s notoriously difficult to get thunderstorm warnings right, and I suppose the only reason the UKMO bother with them is the possibility of the flash flooding that can accompany them. The area affected yesterday was not quite as they anticipated, it ran in more or less a straight line from London to Liverpool, and although the amounts of rainfall were well forecast the thunderstorm activity did go on well past the end time of the validity time of their warning.

Courtesy of Blitzortung
Before 18 UTC and after 18 UTC
Estimated rainfall accumulations from weather radar
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