The Met Office has issued a "yellow" warning of rain for the Midlands this weekend with heavy showers expected to develop in the region this afternoon and into Sunday.
It is thought that as much as 30mm of rain could fall within an hour and 50mm or more in less than three hours this evening.
The Met Office says:
"The public should be aware of the risk of localised disruption to travel, due to surface water flooding and lightning strikes."
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After a wet and windy start, rain will clear to the north to leave it dry, with easing winds but largely cloudy skies.
Early rain will clear northwards during the morning, allowing drier conditions behind.
Thousands of patients have had their operations and appointments cancelled despite a strike by junior doctors being called off.