weather.gov     
National Weather Service

Watches, Warnings & Advisories
NWS Homepage

4 products issued by NWS for:
Share |


Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Baltimore MD/Washington DC
432 PM EDT Fri Aug 18 2017

ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-192045-
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-
432 PM EDT Fri Aug 18 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

A Severe Thunderstorm Watch is in effect until 9 PM. Thunderstorms
across the area will be capable of producing locally damaging
wind gusts and large hail.

A Flash Flood Watch is in effect until 2 AM. Isolated flash
flooding is possible due to locally heavy downpours from training
thunderstorms.

A Heat Advisory is in effect until 8 PM for the Washington and
Baltimore Metropolitan areas as well as portions of the Virginia
Piedmont. Heat indices around 105 degrees are expected.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter networks are activiated through this evening. Please
report severe weather and flooding to the National Weather
Service.

$$



Severe Thunderstorm Watch

WATCH COUNTY NOTIFICATION FOR WATCH 455
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
428 PM EDT FRI AUG 18 2017

DCC001-MDC003-005-009-013-017-021-025-027-031-033-037-510-VAC013-
047-059-061-079-099-107-113-137-153-157-177-179-510-600-610-630-
683-685-190100-
/O.CON.KLWX.SV.A.0455.000000T0000Z-170819T0100Z/

SEVERE THUNDERSTORM WATCH 455 REMAINS VALID UNTIL 9 PM EDT THIS
EVENING FOR THE FOLLOWING AREAS

THE DISTRICT OF COLUMBIA

IN MARYLAND THIS WATCH INCLUDES 12 COUNTIES

IN CENTRAL MARYLAND

ANNE ARUNDEL          HOWARD                MONTGOMERY
PRINCE GEORGES

IN NORTH CENTRAL MARYLAND

CARROLL               FREDERICK

IN NORTHERN MARYLAND

BALTIMORE             BALTIMORE CITY        HARFORD

IN SOUTHERN MARYLAND

CALVERT               CHARLES               ST. MARYS

IN VIRGINIA THIS WATCH INCLUDES 19 COUNTIES

IN CENTRAL VIRGINIA

CITY OF FREDERICKSBURG                      GREENE
KING GEORGE           ORANGE                SPOTSYLVANIA

IN NORTHERN VIRGINIA

ARLINGTON             CITY OF ALEXANDRIA    CITY OF FAIRFAX
CITY OF FALLS CHURCH  CITY OF MANASSAS
CITY OF MANASSAS PARK                       CULPEPER
FAIRFAX               FAUQUIER              LOUDOUN
PRINCE WILLIAM        STAFFORD

IN NORTHWEST VIRGINIA

MADISON               RAPPAHANNOCK

THIS INCLUDES THE CITIES OF ABERDEEN, ALEXANDRIA, ANNAPOLIS,
ARLINGTON, ARNOLD, ASPEN HILL, BALLENGER CREEK, BALTIMORE,
BEL AIR, BETHESDA, BOWIE, CALIFORNIA, CAMP SPRINGS, CATONSVILLE,
CHANTILLY, CHESAPEAKE BEACH, CLINTON, COLLEGE PARK, COLUMBIA,
CULPEPER, DAHLGREN, DUNDALK, DUNKIRK, EDGEWOOD, ELDERSBURG,
ELLICOTT CITY, ESSEX, FAIRFAX, FALLS CHURCH, FALLSTON, FALMOUTH,
FREDERICK, FREDERICKSBURG, GAITHERSBURG, GERMANTOWN, GLEN BURNIE,
GORDONSVILLE, GREENBELT, HAVRE DE GRACE, HERNDON, HUNTINGTOWN,
JOPPATOWNE, LAUREL, LEESBURG, LEXINGTON PARK, LUSBY, MADISON,
MANASSAS, MANASSAS PARK, MCLEAN, NORTH BEACH, ODENTON, ORANGE,
PARKVILLE, PIKESVILLE, POTOMAC, PRINCE FREDERICK, RANDALLSTOWN,
RESTON, ROCKVILLE, SEVERN, SEVERNA PARK, SILVER SPRING,
SOUTH GATE, SPOTSYLVANIA COURTHOUSE, ST. CHARLES, STANARDSVILLE,
STERLING, SUITLAND-SILVER HILL, TOWSON, WALDORF, WARRENTON,
WASHINGTON, WASHINGTON, WESTMINSTER, AND WOODBRIDGE.

$$



Flash Flood Watch

Flood Watch
National Weather Service Baltimore MD/Washington DC
1235 PM EDT Fri Aug 18 2017


DCZ001-MDZ004>006-011-013-014-016>018-503>508-VAZ039-040-050>057-
501-502-505-506-190045-
/O.NEW.KLWX.FF.A.0008.170818T1800Z-170819T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
District of Columbia-Frederick MD-Carroll-Northern Baltimore-
Southern Baltimore-Prince Georges-Anne Arundel-Charles-St. Marys-
Calvert-Northwest Montgomery-Central and Southeast Montgomery-
Northwest Howard-Central and Southeast Howard-Northwest Harford-
Southeast Harford-Madison-Rappahannock-Orange-Culpeper-
Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Stafford-Spotsylvania-
King George-Northern Fauquier-Southern Fauquier-Western Loudoun-
Eastern Loudoun-
Including the cities of Washington, 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, Germantown,
Damascus, Bethesda, Rockville, Gaithersburg, Silver Spring,
Lisbon, Columbia, Ellicott City, Jarrettsville, Aberdeen,
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, and Sterling
1235 PM EDT Fri Aug 18 2017

...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...

The National Weather Service in Sterling Virginia has issued a

* Flash Flood Watch for portions of Maryland, The District of
  Columbia, and Virginia, including the following areas, in
  Maryland, Anne Arundel, Calvert, Carroll, Central and
  Southeast Howard, Central and Southeast Montgomery, Charles,
  Frederick MD, Northern Baltimore, Northwest Harford, Northwest
  Howard, Northwest Montgomery, Prince Georges, Southeast
  Harford, Southern Baltimore, and St. Marys. The District of
  Columbia. In Virginia, Arlington/Falls Church/Alexandria,
  Culpeper, Eastern Loudoun, Fairfax, King George, Madison,
  Northern Fauquier, Orange, Prince William/Manassas/Manassas
  Park, Rappahannock, Southern Fauquier, Spotsylvania, Stafford,
  and Western Loudoun.

* Through late tonight

* Thunderstorms with heavy rainfall are expected across the region
  this afternoon and evening. The potential for training
  thunderstorms exists, which could result in several inches of
  rain in one to two hours. Soils are already very moist, meaning
  most of this rain would rapidly run off.

* Runoff from excessive rainfall may cause rapid rises of water
  in low-lying and poor drainage areas as well as streams and
  creeks, resulting in flash flooding. Urban areas will be most
  susceptible.

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.

&&

$$

RCM



Heat Advisory

URGENT - WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
1115 AM EDT Fri Aug 18 2017


DCZ001-MDZ011-013-014-016-504-506-VAZ052>057-182315-
/O.CON.KLWX.HT.Y.0007.000000T0000Z-170819T0000Z/
District of Columbia-Southern Baltimore-Prince Georges-
Anne Arundel-Charles-Central and Southeast Montgomery-
Central and Southeast Howard-
Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Stafford-Spotsylvania-
King George-
Including the cities of Washington, 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, Bethesda,
Rockville, Gaithersburg, Silver Spring, Columbia, Ellicott City,
Dale City, Manassas, Woodbridge, Lake Ridge, Montclair, Reston,
Herndon, Annandale, Centreville, Chantilly, McLean, Franconia,
Arlington, Alexandria, Falmouth, Fredericksburg, and Dahlgren
1115 AM EDT Fri Aug 18 2017

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING...

* HEAT INDEX VALUES...Around 105 degrees due to temperatures in
  the lower 90s and dewpoints in the mid to upper 70s.

* IMPACTS...The heat and humidity may cause heat stress during
  outdoor exertion or extended exposure.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Heat Advisory means that a period of high temperatures is
expected. The combination of high temperatures and high humidity
will create a situation in which heat illnesses are possible.

Take extra precautions if you work or spend time outside. When
possible, reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear light weight and loose fitting clothing when
possible and drink plenty of water.

To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks
in shaded or air conditioned environments. Anyone overcome by
heat should be moved to a cool and shaded location. Heat stroke
is an emergency - call 911.

&&

$$




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
NATIONAL WEATHER SERVICE: for Safety, for Work, for Fun - FOR LIFE