A Yellow Warning for thunder in Powys has been issued by the Met Office.
Thunderstorms are expected to bring a chance of flooding in places along with possible travel disruption. The alert covers from 3am on Tuesday morning through to 11.30pm on the same day.
A spokesperson for the Met Office said: "Thunderstorms and outbreaks of heavy rain will arrive across the far southwest early on Tuesday, then spreading further northeast across England and Wales and increasing in frequency during the day.
"In a few places there is the potential for 30 mm or rain to fall in an hour or two and 40 mm to fall in 3 hours. Many parts of the warning area will miss the heaviest rainfall."
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