The warning will be in place from 9am tomorrow (Tuesday, July 27) until 6am on Wednesday (July 28).
Some areas could see up to 30mm of rain in around two hours, while up to 60mm of rain could fall in around three to six hours in some spots.
Forecasters have warned motorists that spray and sudden flooding could lead to difficult driving conditions and possibly some road closures
There is also a small chance homes and businesses could be flooded quickly, with damage to some buildings from floodwater or lightning strikes possible.
A spokesman for the Met Office said: "Heavy showers and thunderstorms are expected to develop during Tuesday across much of Wales, northern and central England.
"These will last well into the night across north Wales and north-west England in particular where they could be prolonged in places.
"Lightning and hail may pose additional hazards in a few locations."
Here's what to expect:
- Spray and sudden flooding could lead to difficult driving conditions and possibly some road closures
- Where flooding or lightning strikes occur, there is a chance of delays and some cancellations to train and bus services
- There is a small chance that homes and businesses could be flooded quickly, with damage to some buildings from floodwater or lightning strikes
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