The Met Office issued a new yellow weather warning for thunderstorms on Wednesday. The alert will be in place between 12.52pm and 5pm on July 23.
It covers three areas in the London & South East England region, including Brighton and Hove, East Sussex and Kent.
The yellow warning means can be issued for a range of weather situations but in this case, it has been issued for thunderstorms.
The Met Office said slow-moving heavy showers and thunderstorms will hit parts of Kent and Sussex through Wednesday afternoon.
Some places will miss the downpours, but where they do occur 20-25 mm rain is likely in less than an hour with a chance of 30 to 40 mm falling in one to two hours in a few locations, the Met Office says.
This is likely to lead to some surface water flooding and disruption, whilst lightning strikes may be an additional hazard, reports Yahoo News.
Showers and thunderstorms are expected to slowly die out on Wednesday evening.
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