Update: The NWS has extended the flash flood warning until 4:45 a.m. Thursday.
A flash flood warning is in effect in central Prince William County until 10:45 p.m., the National Weather Service announced.
"Excessive runoff from heavy rainfall will cause flooding of small creeks and streams...urban areas...highways...streets and underpasses as well as other drainage areas and low lying spots," the alert read.
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