Thunderstorms could bring flooding, a slight chance of power cuts, and travel disruption as up to 50mm of rain is expected in just a few hours in Berkshire.
The Met Office has issued a yellow weather warning for parts of southern England, including Bracknell Forest and Reading, with heavy rain and thunderstorms forecast to move northwards on Wednesday morning, August 26.
There is a small chance that homes and businesses could be flooded quickly, with damage possible from floodwater, lightning strikes, or hail.
A Met Office spokesman said: "There is a small chance that homes and businesses could be flooded quickly, with damage to some buildings from floodwater, lightning strikes or hail.
"Where flooding or lightning strikes occur, there is a chance of delays and some cancellations to train and bus services.
"Spray and sudden flooding could lead to difficult driving conditions and some road closures."
The warning covers much of southern and central England, as well as parts of the Midlands, Wales, North West England and Yorkshire & Humber.
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Downpours are expected to move northwards on Wednesday morning, with a chance of further showers and thunderstorms in the afternoon, easing during the evening.
While not everywhere will see the worst of the conditions, the Met Office warns that where storms do hit, they could be intense.
Forecasters say 20 to 30mm of rain could fall in less than an hour, with up to 50mm possible in two to three hours in some locations.
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