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Flash Flood Watch

Flood Watch
National Weather Service Baltimore MD/Washington DC
147 PM EDT Thu Jul 27 2017



DCZ001-MDZ003>006-011-013-014-016>018-501>508-VAZ027>031-040-
051>055-057-501-502-505>507-WVZ050>053-055-501>504-280200-
/O.NEW.KLWX.FF.A.0006.170728T1800Z-170729T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
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-Rappahannock-Culpeper-
Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Stafford-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, Culpeper,
Dale City, Manassas, Woodbridge, Lake Ridge, Montclair, Reston,
Herndon, Annandale, Centreville, Chantilly, McLean, Franconia,
Arlington, Alexandria, Falmouth, 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
147 PM EDT Thu Jul 27 2017

...FLASH FLOOD WATCH IN EFFECT FROM FRIDAY AFTERNOON THROUGH
SATURDAY AFTERNOON...

The National Weather Service in Sterling Virginia has issued a

* Flash Flood Watch 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, King George, Northern Fauquier, Northern
  Virginia Blue Ridge, Page, Prince William/Manassas/Manassas
  Park, Rappahannock, Shenandoah, Southern Fauquier, Stafford,
  Warren, and Western Loudoun. In West Virginia, Berkeley,
  Eastern Grant, Eastern Mineral, Hampshire, Hardy, Jefferson,
  Morgan, Western Grant, and Western Mineral.

* From Friday afternoon through Saturday afternoon

* Low pressure is going to develop over the Mid Atlantic Friday
  and remain nearly stationary this weekend. This will have the
  potential to bring 3 inches or more 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.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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
418 PM EDT Thu Jul 27 2017

ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-281000-
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-
418 PM EDT Thu Jul 27 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
Columbia.

.DAY ONE...Tonight

Scattered thunderstorms are expected over the waters late this
afternoon and evening. A few thunderstorms will be capable of
producing gusty winds.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

A flash flood watch is in effect from Friday afternoon through
Saturday afternoon. Widespread showers and scattered thunderstorms
are expected during this time. Numerous incidents of flash
flooding are likely in the region.

Isolated severe thunderstorms are possible as well Friday with
damaging winds being the primary threat.

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

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed Friday afternoon through Saturday.

$$



U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: May 16, 2007
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