Flood Watch

* WHAT...Flash flooding caused by excessive rainfall continues to be possible.

* WHERE...The District of Columbia, Maryland, including the following areas, Anne Arundel, Carroll, Cecil, Central and Southeast Howard, Central and Southeast Montgomery, Frederick, Northern Baltimore, Northwest Harford, Northwest Howard, Northwest Montgomery, Prince Georges, Southeast Harford and Southern Baltimore, and Virginia, including the following areas, Arlington/Falls Church/Alexandria, Central and Southeast Prince William/Manassas/Manassas Park, Clarke, Eastern Loudoun, Fairfax, Northern Fauquier, Northern Virginia Blue Ridge, Northwest Prince William, Page, Rappahannock, Shenandoah, Warren and Western Loudoun.

* WHEN...Until 11 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... - Clusters of strong to severe thunderstorms are likely to push across the region through this evening. With a continued tropical air mass over the area, very heavy rainfall rates are possible in many of these storms. These rates could approach 2 to 3 inches per hour, with higher instantaneous rates possible. This may cause creeks and stream to quickly rise out of their banks along with potential flash flooding in urban areas. The most vulnerable locations would be urbanized areas along I-95 as well as areas which have experienced heavy rainfall in recent days. - Please visit www.weather.gov/safety/flood for flood safety and preparedness information