Flood Watch In Effect Until 8 PM

...FLOOD WATCH IN EFFECT UNTIL 8 PM EDT THIS EVENING...* WHAT...Flash flooding caused by excessive rainfall is possible.* WHERE...Including the following , District of Columbia, in  Maryland, Anne Arundel, Carroll, Central and Southeast Howard,  Central and Southeast Montgomery, Charles, Frederick MD, Northern  Baltimore, Northwest Harford, Northwest Howard, Northwest  Montgomery, Prince Georges, Southeast Harford and Southern  Baltimore, in Virginia, Arlington/Falls Church/Alexandria, Central  and Southeast Prince William/Manassas/Manassas Park, Eastern  Loudoun, Fairfax, Northwest Prince William and Western Loudoun.* WHEN...Until 8 PM EDT this evening.* IMPACTS...Excessive runoff may result in flooding of rivers,  creeks, streams, and other low-lying and flood-prone locations.* ADDITIONAL DETAILS...  - Showers and thunderstorms are likely this afternoon through    early this evening. Some thunderstorms will produce heavy    rainfall with amounts around 1 to 2 inches within an hour.    Localized amounts up to 3 inches are possible in the    strongest storms. The heavy amounts of rain in a short period    of time may lead to rapid rises of creeks and streams out of    their banks as well as potential flash flooding in urban    areas.  - Please visit www.weather.gov/safety/flood for flood safety    and preparedness informationPRECAUTIONARY/PREPAREDNESS ACTIONS...You should monitor later forecasts and be prepared to take actionshould Flash Flood Warnings be issued.By The National Weather Service, Sterling, Va.