The National Weather Service has issued a Flash Flood Watch for the parts of the Washington area through 6 p.m. Tuesday.
A Flash Flood Warning had been issued for Charles County, southern Prince George's County, southern Anne Arundel County and northwestern Calvert County until 5 p.m.
The Watch includes areas including the District of Columbia, Anne Arundel, Calvert, Charles and Prince George's counties in Maryland and Arlington, Falls Church, Alexandria, Culpeper, Fairfax, Prince William, Manassas, Manassas Park, Spotsylvania and Stafford counties in Virginia.
Forecasters say that showers and thunderstorms, which have overspread most of the region already, will dump moderate to heavy rain throughout the afternoon. One to three inches of rain are possible in some spots, which is enough to cause flash flooding.
Areas impacted by the Flash Flood Warning may have already received up to 3 inches of rain, with more expected. Parts of the counties near the Severn River are impacted, as well as cities and towns including La Plata, Chesapeake Beach, Port Tobacco and others.
A Flash Flood Watch indicates that conditions could develop that lead to a flood. A Warning indicates that flooding is imminent or is already happening.
For more, stay with ABC7 News and the Stormwatch 7 team at wjla.com/weather.