Interactive NWS Alert
Radar valid at 800 pm EDT, Aug 11th 2021
District of Columbia-Washington-Frederick MD-Carroll-
Northern Baltimore-Cecil-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-
Clarke-Prince William/Manassas/Manassas Park-Fairfax-
King George-Northern Fauquier-Southern Fauquier-Western Loudoun-
Including the cities of Washington, Hagerstown, Frederick,
Ballenger Creek, Eldersburg, Westminster, Reisterstown,
Cockeysville, Elkton, 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, Berryville, Dale City, Manassas,
Woodbridge, Lake Ridge, Montclair, Reston, Herndon, Annandale,
Centreville, Chantilly, McLean, Franconia, Arlington, Alexandria,
Falls Church, Falmouth, Fredericksburg, Dahlgren, Warrenton,
Turnbull, Purcellville, Leesburg, Ashburn, Sterling, Paw Paw,
Martinsburg, Charles Town, and Shepherdstown
133 PM EDT Tue Aug 10 2021
...HEAT ADVISORY IN EFFECT FROM NOON TO 8 PM EDT WEDNESDAY...
...EXCESSIVE HEAT WATCH IN EFFECT FROM THURSDAY AFTERNOON THROUGH
* WHAT...For the Heat Advisory, heat index values will range from
around 100 degrees west of Interstate 95 to around 105 degrees
near and east of Interstate 95. For the Excessive Heat Watch,
dangerously hot conditions are possible with heat indices
possibly ranging from around 105 degrees west of Interstate 95
to around 110 degrees near and east of Interstate 95.
* WHERE...The Washington, Baltimore, and Fredericksburg areas,
central and southern Maryland, northern Virginia, and the
eastern panhandle of West Virginia.
* WHEN...For the Heat Advisory, from noon to 8 PM EDT Wednesday.
For the Excessive Heat Watch, from Thursday afternoon through
early Thursday evening.
* IMPACTS...Extreme heat and humidity will significantly increase
the potential for heat related illnesses, particularly for those
working or participating in outdoor activities.
Monitor the latest forecasts and warnings for updates on this
situation. Be prepared to drink plenty of fluids, stay in an air-
conditioned room, stay out of the sun, and check up on relatives
Young children and pets should never be left unattended in
vehicles under any circumstances. This is especially true during
warm or hot weather when car interiors can reach lethal
temperatures in a matter of minutes.
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including emergency managers, community leaders and other government