The National Weather Service has issued a flash flood watch for Woodbridge and Prince William County beginning at noon Friday and lasting for much of the evening.
In Woodbridge, showers and thunderstorms could start at around 1 p.m. and pick up again after 5 p.m. Highs will be near 86.
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Several more showers are expected to happen in intervals throughout the evening and overnight hours, NWS says.
The weather service predicts rainfall could amount to an inch to 2 inches per hour in afternoon storms. That amount could cause local rivers, streams or creeks to overflow and flood surrounding low-lying areas, NWS says.
The watch ends at 11 p.m. Friday.
A chance of storms continues throughout the weekend, but will bring some heat relief: Temperatures in Woodbridge will hover around 82 on Saturday and 87 on Sunday.
Last summer, a flash flood raged through Occoquan, leaving the small town reeling. See photos and video of the flooding.