After weeks of sweltering weather which has caused drought, the Met Office s yellow thunderstorm warning for Wednesday forecasts conditions in which 20-30 mm of rain is possible within an hour .
Thunderstorms and torrential rain have cancelled dozens of flights at Gatwick and created massive delays, leaving some people stuck on the tarmac for four hours.
The whole of England and Wales has been put under a thunderstorm warning for all of today with up to 2in (50mm) of rain set to fall, while a separate rain alert is in place for Scotland.
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