National Weather Service says excessive could result.
...FLOOD WATCH NOW IN EFFECT FROM 4 PM EDT THIS AFTERNOON THROUGH
LATE TONIGHT...
* WHAT...Flash flooding caused by excessive rainfall is possible.
* WHERE...Portions of north central Maryland, including the
following areas, Frederick and Washington, Virginia, including the
following areas, Albemarle, Augusta, Central Virginia Blue Ridge,
Clarke, Culpeper, Eastern Highland, Frederick, Greene, Madison,
Nelson, Northern Fauquier, Northern Virginia Blue Ridge, Orange,
Page, Rappahannock, Rockingham, Shenandoah, Southern Fauquier,
Warren, Western Highland and Western Loudoun, and West Virginia,
including the following areas, Berkeley, Eastern Grant, Eastern
Mineral, Eastern Pendleton, Hampshire, Hardy, Jefferson, Morgan,
Western Grant, Western Mineral and Western Pendleton.
* WHEN...Until 3 AM
* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Flooding may occur in poor drainage and urban areas. Localized
considerable flooding is possible.
* ADDITIONAL DETAILS...
- As a slow-moving frontal system tracks across the area,
multiple rounds of showers and thunderstorms are possible. A
round of thunderstorms with heavy rain will move into the
area this afternoon, followed by a shift to a slow moving
complex of moderate to heavy rain into the evening and night.
An area of total rainfall of 1 to 2 inches is likely, with
localized amounts up to 5 inches possible. Thunderstorms may
produce rain rates of 1 to 2 inches per hour.
- Please visit www.weather.gov/safety/flood for flood safety
and preparedness information
PRECAUTIONARY/PREPAREDNESS ACTIONS...
You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.
By The National Weather Service, Sterling, Va.