* WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...The District of Columbia, in Maryland for the following areas, Central and Southeast Montgomery, Charles and Prince Georges, and Virginia, including the following areas, Arlington/Falls Church/Alexandria, Central and Southeast Prince William/Manassas/Manassas Park, Fairfax, Southern Fauquier, Spotsylvania and Stafford. * WHEN...From late tonight through Wednesday morning. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Showers are likely with isolated thunderstorms late tonight into Wednesday morning as a warm front lifts through the area. Rainfall will likely be heavy at times, with localized rainfall amounts around 2-4 inches within an hour or two possible. This may cause flash flooding in urban areas along with the possibility for creeks and streams to rise quickly out of their banks. - Please visit www.weather.gov/safety/flood for flood safety and preparedness information