840
WWUS71 KLWX 171240
NPWLWX

URGENT - WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
840 AM EDT Thu Jul 17 2025

MDZ003-VAZ028-030-031-WVZ051>053-172045-
/O.EXA.KLWX.HT.Y.0007.250717T1500Z-250718T0000Z/
Washington-Frederick VA-Warren-Clarke-Morgan-Berkeley-Jefferson-
840 AM EDT Thu Jul 17 2025

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

* WHAT...Heat index values around 100 expected.

* WHERE...In Maryland, Washington County. In Virginia, Clarke,
  Frederick VA, and Warren Counties. In West Virginia, Berkeley,
  Jefferson, and Morgan Counties.

* WHEN...Until 8 PM EDT this evening.

* IMPACTS...Hot temperatures and high humidity may cause heat
  illnesses.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.

&&

$$

MDZ004>006-503>507-VAZ501-502-505-506-526-172045-
/O.EXA.KLWX.HT.Y.0007.250717T1500Z-250718T0000Z/
Frederick MD-Carroll-Northern Baltimore-Northwest Montgomery-
Central and Southeast Montgomery-Northwest Howard-Central and
Southeast Howard-Northwest Harford-Northern Fauquier-Southern
Fauquier-Western Loudoun-Eastern Loudoun-Northwest Prince William-
840 AM EDT Thu Jul 17 2025

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

* WHAT...Heat index values around 105 expected.

* WHERE...Portions of central, north central, and northern Maryland
  and northern Virginia.

* WHEN...Until 8 PM EDT this evening.

* IMPACTS...Hot temperatures and high humidity may cause heat
  illnesses.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.

&&

$$

DCZ001-MDZ008-011-013-014-016>018-508-VAZ053>055-057-527-172045-
/O.CON.KLWX.HT.Y.0007.250717T1500Z-250718T0000Z/
District of Columbia-Cecil-Southern Baltimore-Prince Georges-Anne
Arundel-Charles-St. Marys-Calvert-Southeast Harford-Fairfax-
Arlington/Falls Church/Alexandria-Stafford-King George-Central
and Southeast Prince William/Manassas/Manassas Park-
840 AM EDT Thu Jul 17 2025

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

* WHAT...Heat index values around 105 expected.

* WHERE...Portions of DC, central, northeast, northern, and southern
  Maryland, and central and northern Virginia.

* WHEN...Until 8 PM EDT this evening.

* IMPACTS...Hot temperatures and high humidity may cause heat
  illnesses.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.

Take extra precautions when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.

&&

$$

KJP