The Brief A flash flood warning is in effect for parts of Fulton and Cobb counties as heavy, slow-moving storms hit metro Atlanta. A flash flood warning is impacting Fulton and Cobb counties after slow-moving storms dumped nearly two inches of rain in under an hour. Wet weather aheadWhat we know:Storms sitting directly over the metro area have triggered a flash flood warning stretching from North Avenue up Interstate 75 toward Vinings. Wednesday: The wettest day of the week with widespread storms firing up by 2 p.m. or 3 p.m. (70% chance). Thursday & Friday: Scattered to widespread afternoon storms continue (60% chance Thursday) before tapering heading into the weekend.