A long duration, heavy rain event is bearing down on the D.C. region. Flash flood warnings have already been posted and more are possible in the coming hours. New flash flood warning in the Beltway, including Arlington, Falls Church and Alexandria. Within moments a flash flood can unleash waters into low roads, parking lots and basements. This is how a flash flood occurs and what you need to do to stay safe.

Source: Washington Post July 28, 2017 15:33 UTC