FFWLWX The National Weather Service in Sterling Virginia has issued a * Flash Flood Warning for... District of Columbia... South Central Montgomery County in central Maryland... Arlington County in northern Virginia... Northeastern Fairfax County in northern Virginia... The City of Alexandria in northern Virginia... The City of Falls Church in northern Virginia... * Until 845 PM EDT. * At 544 PM EDT, Doppler radar indicated thunderstorms producing heavy rain will move across the warned area. Rain may have not started, but expected rainfall rates of 1 to 2 inches in 20 minutes are anticipated. Additional rainfall amounts of 1 to 3 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar. IMPACT...Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. * Some locations that will experience flash flooding include... Arlington... Alexandria... Bethesda... Annandale... Springfield... Fort Washington... Fort Hunt... Vienna... Groveton... Falls Church... Huntington... Coral Hills... Mantua... Fort Belvoir... Pimmit Hills... National Harbor... Rosslyn... Crystal City... Mclean... Reagan National Airport...