A flood watch has been issued for the District of Columbia, northern Virginia, Baltimore and other parts of Maryland.
Strong rain and lightning knocked out power to thousands of people overnight in the Washington and Baltimore areas.
Federal officials say Maryland has been awarded more than $7 million in grants for projects to protect communities against damage from future storms.
Thousands are still without power after a massive storm system brought torrential rains, heavy winds and possibly tornadoes to the Mid-Atlantic Thursday.
A gigantic line of powerful thunderstorms could affect one in five Americans on Wednesday as it rumbles across the Midwest toward Washington packing hail, lightning and tree-toppling winds.
Flash flood and severe thunderstorm warnings blanketed the area as roads flooded and thousands of residents lost power.
Eleven days after the windstorm, more than 2,300 Amherst County residents remain without power.
Hundreds of thousands from the Midwest to the Mid-Atlantic were preparing to spend the Fourth of July like America’s founders did in 1776, without the conveniences of electricity and air conditioning.
Utility crews struggled to catch up with a backlog of millions of people without electricity for a fourth hot day Tuesday as frustration grew and authorities feared the toll of 22 storm deaths could rise because of stifling conditions and generator fumes.
More than 276,000 electricity customers across Virginia have no service as crews work to repair power lines and equipment damaged by severe storms.