Met Office maps show the region could be hit by thundery downpours, as temperatures start to dip.
Further heavy showers and thunderstorms are expected across England this week, with the Met Office issuing a yellow weather warning.
This morning (August 17) has been a grey start as heavy and thundery showers continue to clear northwards.
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But heavy and thundery showers in the south to start will move northwards through the evening before tending to ease overnight, although still showers for some.
Tuesday is a rather cloudy morning with spells of rain for many then heavier, perhaps thundery, showers possible in the afternoon.
The Met Office said: "Some heavy showers and thunderstorms are expected overnight, with further thunderstorms then developing across many areas of England and Wales during the late morning and afternoon, when they are likely to be slow moving.
"Some places within the warning area will miss the thunderstorms altogether, but where they do occur 20-40 mm of rain may fall within an hour with 50-70 mm possible in three or four hours.
"Lightning, hail and possibly gusty winds will be additional hazards."
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What to expect
- Spray and sudden flooding could lead to difficult driving conditions and some road closures
- Power cuts might occur and other services to some homes and businesses could be lost
- Flooding of homes and businesses could happen quite quickly, with damage to some buildings from floodwater or perhaps lightning.
- Fast-flowing or deep flood water is possible.
- Where flooding or lightning strikes occur, there is a chance of delays and some cancellations to train and bus services