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Flash Flood Warning

Flash Flood Warning

Flash Flood Warning
National Weather Service Baltimore MD/Washington DC
318 PM EDT FRI JUL 28 2017

The National Weather Service in Sterling Virginia has issued a

* Flash Flood Warning for...
  The southeastern District of Columbia...
  West central Prince Georges County in central Maryland...
  Southern Arlington County in northern Virginia...
  The City of Falls Church in northern Virginia...
  East central Fairfax County in northern Virginia...
  The City of Alexandria in northern Virginia...

* Until 615 PM EDT

* At 318 PM EDT, Doppler radar and automated rain gauges indicated
  thunderstorms producing heavy rain across the area. One to two
  inches of rain has already fallen. Additional rainfall amounts of
  one to two inches are possible. Flash flooding is expected to
  begin shortly.

* Some locations that may experience flooding include...
  Arlington, Alexandria, Annandale, Springfield, Vienna, Falls
  Church, Huntington, Coral Hills, Mantua, National Harbor, Reagan
  National Airport, Crystal City, RFK Stadium, Nationals Park, Burke,
  Landover, Lincolnia, Franconia, Oxon Hill and Merrifield.


Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.


LAT...LON 3879 7695 3879 7726 3890 7725 3886 7704
      3893 7696 3893 7687



Short Term Forecast

Short Term Forecast
National Weather Service Baltimore MD/Washington DC
302 PM EDT FRI JUL 28 2017

District of Columbia-Prince Georges-Fairfax-Arlington/Falls
302 PM EDT FRI JUL 28 2017


At 301 PM EDT, radar indicated strong thunderstorms were located
along a line extending from Fairfax to Reagan National Airport.
Movement was northeast at 15 mph.

Heavy rainfall of one to two inches can be expected.

Locations impacted include...
Arlington, Alexandria, Annandale, Springfield, Fairfax, Vienna, Falls
Church, Huntington, Coral Hills, Mantua, National Harbor, Reagan
National Airport, Crystal City, Nationals Park, Burke, Oakton,
Lincolnia, Franconia, Oxon Hill and Merrifield.

Heavy rainfall is occurring with these storms, and may cause ponding
of water on roadways and cause small streams to go out of their
banks. Be alert for standing water and hydroplaning.

LAT...LON 3879 7701 3879 7703 3881 7702 3882 7703
      3885 7702 3884 7705 3881 7704 3881 7703
      3879 7704 3881 7737 3890 7732 3888 7705
      3886 7703 3886 7702 3888 7704 3887 7689
TIME...MOT...LOC 1901Z 221DEG 14KT 3886 7732 3884 7703



Flash Flood Watch

Flood Watch
National Weather Service Baltimore MD/Washington DC
159 PM EDT Fri Jul 28 2017

District of Columbia-Washington-Frederick MD-Carroll-
Northern Baltimore-Southern Baltimore-Prince Georges-Anne Arundel-
Charles-St. Marys-Calvert-Extreme Western Allegany-
Central and Eastern Allegany-Northwest Montgomery-
Central and Southeast Montgomery-Northwest Howard-
Central and Southeast Howard-Northwest Harford-Southeast Harford-
Shenandoah-Frederick VA-Page-Warren-Clarke-Greene-Madison-
Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Stafford-Spotsylvania-
King George-Northern Fauquier-Southern Fauquier-Western Loudoun-
Eastern Loudoun-Northern Virginia Blue Ridge-Hampshire-Morgan-
Berkeley-Jefferson-Hardy-Western Grant-Eastern Grant-
Western Mineral-Eastern Mineral-
Including the cities of Washington, Hagerstown, Frederick,
Ballenger Creek, Eldersburg, Westminster, Reisterstown,
Cockeysville, Baltimore, Bowie, Suitland-Silver Hill, Clinton,
College Park, Greenbelt, Laurel, Camp Springs, Glen Burnie,
Annapolis, Severn, South Gate, Severna Park, Arnold, Odenton,
St. Charles, Waldorf, Lexington Park, California,
Chesapeake Beach, Huntingtown, Dunkirk, North Beach, Lusby,
Prince Frederick, Frostburg, Cumberland, Germantown, Damascus,
Bethesda, Rockville, Gaithersburg, Silver Spring, Lisbon,
Columbia, Ellicott City, Jarrettsville, Aberdeen, Strasburg,
Woodstock, Mount Jackson, New Market, Winchester, Luray,
Shenandoah, Stanley, Front Royal, Berryville, Stanardsville,
Madison, Orange, Gordonsville, Culpeper, Dale City, Manassas,
Woodbridge, Lake Ridge, Montclair, Reston, Herndon, Annandale,
Centreville, Chantilly, McLean, Franconia, Arlington, Alexandria,
Falmouth, Fredericksburg, Dahlgren, Warrenton, Turnbull,
Purcellville, Leesburg, Ashburn, Sterling, Big Meadows, Romney,
Paw Paw, Martinsburg, Charles Town, Shepherdstown, Moorefield,
Bayard, Mount Storm, Petersburg, Elk Garden, Antioch, Keyser,
New Creek, Ridgeville, Russelldale, Headsville, and Fort Ashby
159 PM EDT Fri Jul 28 2017


The Flash Flood Watch continues for

* Portions of Maryland, The District of Columbia, Virginia, and
  West Virginia, including the following areas, in Maryland,
  Anne Arundel, Calvert, Carroll, Central and Eastern Allegany,
  Central and Southeast Howard, Central and Southeast
  Montgomery, Charles, Extreme Western Allegany, Frederick MD,
  Northern Baltimore, Northwest Harford, Northwest Howard,
  Northwest Montgomery, Prince Georges, Southeast Harford,
  Southern Baltimore, St. Marys, and Washington. The District of
  Columbia. In Virginia, Arlington/Falls Church/Alexandria,
  Clarke, Culpeper, Eastern Loudoun, Fairfax, Frederick VA,
  Greene, King George, Madison, Northern Fauquier, Northern
  Virginia Blue Ridge, Orange, Page, Prince
  William/Manassas/Manassas Park, Rappahannock, Shenandoah,
  Southern Fauquier, Spotsylvania, Stafford, Warren, and Western
  Loudoun. In West Virginia, Berkeley, Eastern Grant, Eastern
  Mineral, Hampshire, Hardy, Jefferson, Morgan, Western Grant,
  and Western Mineral.

* Through Saturday afternoon

* Low pressure will develop over the Mid Atlantic today and move
  slowly off the coast through Saturday. Radar estimates over 3
  inches fell Friday morning in Montgomery County. This system
  will have the potential to bring 3 to 5 more inches of rain to
  the region through Saturday afternoon. Thunderstorms could cause
  locally higher rainfall amounts.

* Heavy rainfall may result in rapid rises in streams and
  creeks. This could quickly result in flooding...especially in
  low lying and poor drainage areas.


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.



Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Baltimore MD/Washington DC
130 PM EDT Fri Jul 28 2017

Chesapeake Bay north of Pooles Island MD-
Chesapeake Bay from Pooles Island to Sandy Point MD-
Chesapeake Bay from Sandy Point to North Beach MD-
Chesapeake Bay from North Beach to Drum Point MD-
Chesapeake Bay from Drum Point MD to Smith Point VA-
Tidal Potomac from Key Bridge to Indian Head MD-
Tidal Potomac from Indian Head to Cobb Island MD-
Tidal Potomac from Cobb Island MD to Smith Point VA-
Patapsco River including Baltimore Harbor-
Chester River to Queenstown MD-Eastern Bay-
Choptank River to Cambridge MD and the Little Choptank River-
Patuxent River to Broomes Island MD-
Tangier Sound and the inland waters surrounding Bloodsworth
Island-District of Columbia-Southern Baltimore-Prince Georges-
Anne Arundel-Charles-St. Marys-Calvert-Southeast Harford-
Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Stafford-Spotsylvania-
King George-
130 PM EDT Fri Jul 28 2017

This Hazardous Weather Outlook is for the Maryland portion of the
Chesapeake Bay, Tidal Potomac River, and adjacent counties in
central Maryland and northern Virginia as well as the District of

.DAY ONE...This Afternoon and Tonight

A Flash Flood Watch is in effect through Saturday afternoon.
Showers and thunderstorm with heavy rain are expected. Flash
flooding is likely. Gusty winds or an isolated tornado are
possible as well, including over the tidal Potomac and Maryland
portion of the Chesapeake Bay.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

A Flash Flood Watch continues through Saturday afternoon.

A Gale Warning may be needed for portions of the waters Saturday
afternoon through Saturday night.


Spotter activation may be needed through Saturday.


U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
Page last modified: May 16, 2007
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