Heavy rain drenched the mid-Atlantic region, knocking out power to tens of thousands of customers, flooding roads and prompting evacuations.

The National Weather Service says up to 7 inches of rain fell in Calvert County, Md., and about 4 inches fell in the District of Columbia and northern Virginia from Sunday afternoon to Monday evening.

A flood warning was issued for the Potomac River in Fairfax County, Va., and Montgomery County, Md., until Tuesday evening.

Authorities said trees came down due to high winds and saturated soil, cutting power to more than 70,000 homes and businesses.

Numerous roads also were closed because of high water, and firefighters reported receiving phone calls from stranded motorists who had to be rescued.