Forecasters have warned of thunderstorms and heavy rain for Sunday across much of England and parts of eastern Wales.
As a result, the Met Office reports that there is a "small chance of flooding and disruption" in certain locations.
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A yellow warning telling people to "be aware" went into effect for wide parts of southern England, the Midlands, and the north at 04:00 BST. The deadline is 21:00.
Forecasters warn that on Sunday morning, thunderstorms and a lot of rain are expected to start in the south of England and move northward over the day.
The warning covers a region in central England that stretches from the Isle of Wight to Newcastle upon Tyne.
The eastern counties of Wales—Monmouthshire, Newport, Torfaen, and Wrexham—are under alert.