It includes Frederick & Washington Counties
...FLOOD WATCH IN EFFECT UNTIL 4 PM EDT THIS AFTERNOON... * WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...Portions of north-central and western Maryland, the northern Shenandoah Valley in northwestern Virginia, and the eastern panhandle of West Virginia, including the following areas: in Maryland, Frederick and Washington. In Virginia, Clarke, Frederick, Page, Shenandoah and Warren. In West Virginia, Berkeley, Jefferson and Morgan. * WHEN...Until 4 PM EDT this afternoon. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Slow-moving showers and thunderstorms producing very heavy rainfall rates may result in several instances of flash flooding through late afternoon. - Please visit https://www.weather.gov/safety/flood for flood safety and preparedness information. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. By The National Weather Service, Sterling, Va.