Effective: 2020-07-23 20:13:00 EDT Expires: 2020-07-24 02:00:00 EDT Urgency: Expected Severity: Severe Certainty: Possible Instruction: A Flash Flood Watch means that conditions may develop that lead to flash flooding. Flash flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Target Area: Arlington, Falls Church, Alexandria; Fairfax; Prince William, Manassas, Manassas Park FLASH FLOOD WATCH IN EFFECT UNTIL 2 AM EDT FRIDAY The National Weather Service in Sterling Virginia has issued a * Flash Flood Watch for portions of central Maryland, The District of Columbia, and northern Virginia, including the following areas, in central Maryland, Central and Southeast Montgomery and Prince Georges. The District of Columbia. In northern Virginia, Arlington/Falls Church/Alexandria, Fairfax, and Prince William. * Until 2 AM EDT Friday * Slow moving thunderstorms are developing across the Washington DC Metropolitan Area this evening. Localized rainfall amounts up to two inches in an hour are possible. These amounts could lead to flash flooding, especially along small streams and in poor drainage urban areas.