The Met Office has issued a yellow warning for thunder storms on Wednesday afternoon.
The North West is likely to see torrential rain between 12pm and 9pm, with a risk of flash floods in low lying areas.
Travel may be disrupted and homes and there is a small chance homes and businesses could be damaged.
A spokesperson said: “Slow-moving heavy showers and thunderstorms will break out across many parts of the UK again on Wednesday afternoon. Some places will miss them, but where they do occur they will bring torrential downpours with 25 to 35 mm rain falling in an hour and perhaps 50 mm in 2 to 3 hours in one or two places.
“Lightning and hail will be additional hazards. These showers and thunderstorms will only slowly die out through the evening.”
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