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Flash Flood Warning

Flash Flood Warning

Flash Flood Warning
National Weather Service Baltimore MD/Washington DC
654 PM EDT Wed Aug 12 2020

The National Weather Service in Sterling Virginia has issued a

* Flash Flood Warning for...
  Western Montgomery County in central Maryland...
  Northeastern Loudoun County in northern Virginia...
  Northwestern Fairfax County in northern Virginia...

* Until 1030 PM EDT.

* At 653 PM EDT, Doppler radar and automated gauges indicated
  thunderstorms producing heavy rain across the area. Up to two
  inches of rain have already fallen, especially near Sterling
  Virginia. Rain of one to two inches is expected in the next hour.
  Flash flooding is ongoing or expected to begin shortly.

  HAZARD...Life threatening flash flooding. Heavy rain producing
           flash flooding.

  SOURCE...Radar and automated gauges.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that may experience flooding include...
  Germantown...                     Rockville...
  Bethesda...                       Gaithersburg...
  Reston...                         Leesburg...
  Herndon...                        Broadlands...
  Lansdowne...                      Lowes Island...
  Brambleton...                     Poolesville...
  American Legion Bridge...         Potomac...
  Ashburn...                        Oakton...
  Montgomery Village...             Sterling...
  North Potomac...                  Wolf Trap...


Turn around, don`t drown when encountering flooded roads. Most flood
deaths occur in vehicles.

A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.


LAT...LON 3911 7717 3898 7714 3891 7731 3904 7764
      3924 7759 3922 7745 3929 7731




Flash Flood Watch

Flood Watch
National Weather Service Baltimore MD/Washington DC
644 PM EDT Wed Aug 12 2020

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-
Augusta-Rockingham-Shenandoah-Frederick VA-Page-Warren-Clarke-
Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Stafford-Spotsylvania-
King George-Northern Fauquier-Southern Fauquier-Western Highland-
Eastern Highland-Western Loudoun-Eastern Loudoun-
Northern Virginia Blue Ridge-Central Virginia Blue Ridge-
Hampshire-Morgan-Berkeley-Jefferson-Hardy-Western Grant-
Eastern Grant-Western Mineral-Eastern Mineral-Western Pendleton-
Eastern Pendleton-
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, Staunton,
Waynesboro, Stuarts Draft, Harrisonburg, Strasburg, Woodstock,
Mount Jackson, New Market, Winchester, Luray, Shenandoah,
Stanley, Front Royal, Berryville, Lovingston, Charlottesville,
Stanardsville, Madison, Orange, Gordonsville, Culpeper,
Dale City, Manassas, Woodbridge, Lake Ridge, Montclair, Reston,
Herndon, Annandale, Centreville, Chantilly, McLean, Franconia,
Arlington, Alexandria, Falls Church, Falmouth, Fredericksburg,
Dahlgren, Warrenton, Turnbull, Hightown, Monterey, Purcellville,
Leesburg, Ashburn, Sterling, Big Meadows, Wintergreen, Romney,
Paw Paw, Martinsburg, Charles Town, Shepherdstown, Moorefield,
Bayard, Mount Storm, Petersburg, Elk Garden, Antioch, Keyser,
New Creek, Ridgeville, Russelldale, Headsville, Fort Ashby,
Riverton, Brandywine, Franklin, Oak Flat, Ruddle, and Sugar Grove
644 PM EDT Wed Aug 12 2020


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,
  Northern Baltimore, Northwest Harford, Northwest Howard,
  Northwest Montgomery, Prince Georges, Southeast Harford,
  Southern Baltimore, St. Marys, and Washington. The District of
  Columbia. In Virginia, Albemarle, Arlington/Falls
  Church/Alexandria, Augusta, Central Virginia Blue Ridge,
  Clarke, Culpeper, Eastern Highland, Eastern Loudoun, Fairfax,
  Frederick, Greene, King George, Madison, Nelson, Northern
  Fauquier, Northern Virginia Blue Ridge, Orange, Page, Prince
  William, Rappahannock, Rockingham, Shenandoah, Southern
  Fauquier, Spotsylvania, Stafford, Warren, Western Highland,
  and Western Loudoun. In West Virginia, Berkeley, Eastern
  Grant, Eastern Mineral, Eastern Pendleton, Hampshire, Hardy,
  Jefferson, Morgan, Western Grant, Western Mineral, and Western

* Until 11 PM EDT this evening

* There is higher than usual risk from flash flooding. Numerous
  thunderstorms will continue to form around the region through
  this evening. They will be slow moving, and produce localized
  areas of very heavy rain.

* Potential impacts include rapid rises of water, flooded roads
  and flooding of structures in low lying areas near streams.
  Landslides and sinkholes are also possible.


A Flash Flood Watch means that rapid rises of water and flash
flooding are POSSIBLE. Flash flooding is a very dangerous

Those in low lying areas and near streams should monitor water
levels during heavy rain and be prepared to move to high ground
quickly if flooding is observed, or NWS warnings are issued.

Drivers should be very cautious this afternoon and tonight. Low
areas may become flooded, and heavy rain can cause poor drainage
flooding quickly. If you encounter a flooded road, turn around,
don`t drown.



Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Baltimore MD/Washington DC
1101 AM EDT Wed Aug 12 2020

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-
1101 AM EDT Wed Aug 12 2020

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...Today and Tonight

There is higher than usual risk from flash flooding. Numerous
thunderstorms will form around the region this afternoon through
this evening. They will be slow moving, and produce localized
areas of very heavy rain. A Flash Flood Watch is in effect for
this threat from noon to 11pm. The most likely time for flash
flooding within the watch period is 2pm to 8pm. An isolated
damaging wind gust is also possible in any thunderstorm.

Additional storms with localized heavy rain could form again in
the early morning hours before dawn.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Thunderstorms with very heavy rain and a potential for flash
flooding are likely again on Thursday afternoon and evening.


Spotter activation is not expected at this time. But any flooding
reports should be relayed to the National Weather Service.


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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