Event extended (both time and area). Flash Flood Watch from 8/17/2021 8:00 PM to 8/18/2021 10:00 PM EDT for Central Maryland, Delmarva/Southern MD, Southern PA. More information.
Interactive NWS Alert
Radar valid at 1000 pm EDT, Aug 18th 2021
District of Columbia-Frederick MD-Carroll-Northern Baltimore-
Northwest Montgomery-Central and Southeast Montgomery-Northwest
Howard-Central and Southeast Howard-Northwest Harford-Augusta-Page-
Culpeper-Prince William/Manassas/Manassas Park-Fairfax-
Fauquier-Southern Fauquier-Western Loudoun-Eastern Loudoun-Northern
Virginia Blue Ridge-Central Virginia Blue Ridge-Jefferson-
Including the cities of Shepherdstown, Silver Spring, Charles Town,
Charlottesville, Herndon, Arlington, Manassas, Jarrettsville,
Westminster, Damascus, Falls Church, Purcellville, Lovingston,
Bethesda, Chantilly, Orange, Luray, Ballenger Creek, Centreville,
Culpeper, Berryville, Sterling, Reisterstown, Columbia,
Fredericksburg, Staunton, Falmouth, Shenandoah, Ashburn, Waynesboro,
Front Royal, Stuarts Draft, Leesburg, McLean, Rockville, Frederick,
Lake Ridge, Dale City, Alexandria, Stanley, Reston, Montclair,
Turnbull, Big Meadows, Madison, Eldersburg, Ellicott City,
Germantown, Woodbridge, Stanardsville, Washington, Annandale,
Warrenton, Cockeysville, Lisbon, Gaithersburg, Gordonsville,
Franconia, and Wintergreen
401 PM EDT Tue Aug 17 2021
...FLASH FLOOD WATCH IN EFFECT FROM 8 PM EDT THIS EVENING THROUGH
The National Weather Service in Sterling Virginia has expanded the
* Flash Flood Watch to include portions of DC, Maryland, Virginia
and panhandle West Virginia, including the following areas: in DC,
District of Columbia. In Maryland, Carroll, Central and Southeast
Howard, Central and Southeast Montgomery, Frederick MD, Northern
Baltimore, Northwest Harford, Northwest Howard and Northwest
Montgomery. In Virginia, Albemarle, Arlington/Falls
Church/Alexandria, Augusta, Central Virginia Blue Ridge, Clarke,
Culpeper, Eastern Loudoun, Fairfax, Greene, Madison, Nelson,
Northern Fauquier, Northern Virginia Blue Ridge, Orange, Page,
Prince William/Manassas/Manassas Park, Rappahannock, Southern
Fauquier, Spotsylvania, Stafford, Warren and Western Loudoun. In
panhandle West Virginia, Jefferson.
* From 8 PM EDT this evening through Wednesday evening.
* Multiple rounds of heavy showers and thunderstorms will affect the
region from this evening through Wednesday evening. Tropical
moisture will lead to potential precipitation rates of 1 to 2
inches per hour. Localized storm total rain amounts in excess of 3
inches are possible.
* Heavy rain over a short amount of time may result in rapid rises
on streams and creeks and in urbanized and poor drainage areas.
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