The D.C. region awoke Thursday to power outages, downed trees and flooded roadways in some areas as heavy rains hit overnight and throughout the morning.

       Maryland, Virginia and D.C. officials warned drivers and pedestrians to use caution and allow extra time.

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       In D.C., all lanes of the westbound side of Military Road near Beach Drive NW were closed because of a downed tree.

       Officials in Virginia said there were at least a dozen reports of high water on roads in the Franconia, McLean and Reston areas.

       Parts of Interstate 66 in the Arlington and Centreville areas had reports of high-standing water. Ian Crawford, a traffic reporter for WTOP, said the highway in parts was “like a fishing pond.”

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       In Maryland, part of Route 355 south was closed near Urbana Parkway in the Ijamsville area of Frederick County because of the flooding. Crews were working to close Beach Drive near Cedar Lane in Maryland after officials said water had “overflowed [the] banks” and rescuers had to help a driver whose vehicle got stranded in high water on Beach Drive near Connecticut Avenue in the Kensington area.

       Frederick County Public Schools closed for the day because of the bad weather and parts of the area being under flood watches and warnings. Public schools in Carroll County were opening two hours late because of the weather.

       About 5,000 customers in Maryland and Virginia were without power.

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       In Maryland, about 1,400 customers of Pepco in the National Harbor area were without power early Thursday. It is not known when their power would be restored.

       Virginia had about 4,100 customers of Dominion Energy without power early Thursday. Most of those customers were in the Arlington, Alexandria and Annandale areas.

       The Post’s Capital Weather Gang said Thursday is expected to have heavy rains in the morning with some possibly strong winds. By the afternoon, drier air is expected to come into the region and temperatures are forecast to be in the low to mid-70s.