Event extended (time). Flash Flood Watch from 9/23/2021 2:46 AM to 2:00 PM EDT for Central Maryland, Delmarva/Southern MD, Southern PA. More information.
Interactive NWS Alert
Radar valid at 200 pm EDT, Sep 23rd 2021
District of Columbia-Carroll-Northern Baltimore-Cecil-Southern
Baltimore-Northwest Montgomery-Central and Southeast Montgomery-
Northwest Howard-Central and Southeast Howard-Northwest Harford-
Southeast Harford-Fairfax-Arlington/Falls Church/Alexandria-Eastern
Including the cities of Elkton, Herndon, Arlington, Jarrettsville,
Westminster, Damascus, Silver Spring, Bethesda, Chantilly,
Centreville, Sterling, Reisterstown, Columbia, Ashburn, Germantown,
Leesburg, McLean, Rockville, Alexandria, Falls Church, Reston,
Baltimore, Eldersburg, Ellicott City, Franconia, Washington,
Annandale, Cockeysville, Lisbon, Gaithersburg, and Aberdeen
246 AM EDT Thu Sep 23 2021
...FLASH FLOOD WATCH NOW IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...
The Flash Flood Watch is now in effect for
* Portions of DC, Maryland and northern Virginia, including the
following areas: in DC, District of Columbia. In Maryland,
Carroll, Cecil, Central and Southeast Howard, Central and
Southeast Montgomery, Northern Baltimore, Northwest Harford,
Northwest Howard, Northwest Montgomery, Southeast Harford and
Southern Baltimore. In northern Virginia, Arlington/Falls
Church/Alexandria, Eastern Loudoun and Fairfax.
* Until 2 PM EDT this afternoon.
* Multiple rounds of showers and scattered thunderstorms capable of
producing heavy rain are expected through this afternoon. The most
widespread heavy rain is most likely late tonight through early
this afternoon. Average rainfall amounts of 1 to 2 inches are
expected, with localized higher amounts of up to 4 inches
possible. Heavy rain falling over increasingly saturated ground
may result in flash flooding.
You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.
iNWS is an experimental service intended for NWS core partners,
including emergency managers, community leaders and other government