A YELLOW warning is in place for tomorrow as thunderstorms are expected.
The Met Office issued the 20-hour warning as rain bringing up to 40mm of rain in places is expected just after midnight.
There is also a small chance that homes and businesses could be flooded quickly, with damage to some buildings from floodwater, lightning strikes, hail or strong winds.
(The weather warning.)
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The Met Office warning said: "Where flooding or lightning strikes occur, there is a chance of delays and some cancellations to train and bus services.
"There is a slight chance that power cuts could occur and other services to some homes and businesses could be lost."
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