The National Weather Service (NWS) issued a flash flood warning for Washington, D.C., Arlington and Fairfax counties in Virginia, and Montgomery and Prince George’s counties in Maryland, effective until 8:45 p.m. Wednesday. Slow-moving thunderstorms, fed by tropical moisture, were producing rainfall rates of up to 3 inches an hour and rapidly inundating low-lying streets across the capital region. Radar also triggered a tornado warning for the District and nearby Chillum, Maryland, around 6:45 p.m. after rotation was detected near Howard University. The alert expired shortly before 7 p.m., but a severe thunderstorm watch remains in force until 10 p.m. The storms have generated wind gusts approaching 55 mph, frequent lightning and localized street flooding. The Federal Aviation Administration briefly halted departures at Reagan National, Dulles International and Baltimore/Washington International airports until about 7:30–8 p.m. as visibility deteriorated. A broader flood watch covers most of the metropolitan area through midnight, with the NWS warning that an additional 1–3 inches of rain could fall overnight. Forecasters expect showers to linger into Thursday, keeping the risk of renewed flooding in place.