A thunderstorm in a wildfire-scarred area of Northern California dumped up to 1½ inches of rain in an hour, toppling trees and trapping motorists in flooded roads.

National Weather Service meteorologist Craig Shoemaker says the thunderstorm Thursday afternoon caused streams to quickly swell and roads to flood.

He says heavy rain in a short period of time is the worst thing that can happen in the burn scar. He says there are some reports of debris flowing downhill from Paradise to the city of Chico, 14 miles away.

Paradise was destroyed by a blaze three weeks ago and the weather service issued a flash flood warning Thursday, saying heavy rain could unleash mudslides. The warning will be in effect through Thursday night. 

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