493
WWUS71 KLWX 040447
NPWLWX
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1247 AM EDT SAT JUL 4 2026
MDZ003-VAZ027>031-WVZ050>053-055-041300-
/O.UPG.KLWX.HT.Y.0007.260704T1400Z-260705T0000Z/
/O.EXB.KLWX.XH.W.0004.260704T1400Z-260705T0000Z/
WASHINGTON-SHENANDOAH-FREDERICK-PAGE-WARREN-CLARKE-HAMPSHIRE-
MORGAN-BERKELEY-JEFFERSON-HARDY-
1247 AM EDT SAT JUL 4 2026
...EXTREME HEAT WARNING IN EFFECT FROM 10 AM THIS MORNING TO 8 PM
EDT THIS EVENING...
* WHAT...DANGEROUSLY HOT CONDITIONS WITH HEAT INDEX VALUES UP TO 105
TO 108 EXPECTED.
* WHERE...PORTIONS OF NORTH CENTRAL MARYLAND, NORTHWEST VIRGINIA,
AND EASTERN AND PANHANDLE WEST VIRGINIA.
* WHEN...FROM 10 AM THIS MORNING TO 8 PM EDT THIS EVENING.
* IMPACTS...HEAT RELATED ILLNESSES INCREASE SIGNIFICANTLY DURING
EXTREME HEAT AND HIGH HUMIDITY EVENTS.
* ADDITIONAL DETAILS...EARLY MORNING LOW TEMPERATURES IN THE 70S
COMBINED WITH OPPRESSIVE HUMIDITY WILL RESULT IN LITTLE TO NO
OVERNIGHT RELIEF. PROLONGED EXCESSIVE HEAT MAY IMPACT POWER,
WATER, AND TRANSPORTATION SYSTEMS. HEAT INDEX VALUES OF 95 TO 100
ARE POSSIBLE AGAIN SUNDAY AFTERNOON.
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-MDZ004>006-008-011-013-014-016>018-503>508-VAZ036>040-050-051-
053>057-501-502-505-506-526-527-041300-
/O.CON.KLWX.XH.W.0004.260704T1400Z-260705T0100Z/
DISTRICT OF COLUMBIA-FREDERICK-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-NELSON-ALBEMARLE-GREENE-MADISON-RAPPAHANNOCK-
ORANGE-CULPEPER-FAIRFAX-ARLINGTON/FALLS CHURCH/ALEXANDRIA-
STAFFORD-SPOTSYLVANIA-KING GEORGE-NORTHERN FAUQUIER-SOUTHERN
FAUQUIER-WESTERN LOUDOUN-EASTERN LOUDOUN-NORTHWEST PRINCE WILLIAM-
CENTRAL AND SOUTHEAST PRINCE WILLIAM/MANASSAS/MANASSAS PARK-
1247 AM EDT SAT JUL 4 2026
...EXTREME HEAT WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO
9 PM EDT THIS EVENING...
* WHAT...FOR THE EXTREME HEAT WARNING, DANGEROUSLY HOT CONDITIONS
WITH HEAT INDEX VALUES 110 TO 115 EXPECTED.
* WHERE...WASHINGTON DC, AND PORTIONS OF CENTRAL, NORTH CENTRAL,
NORTHEAST, NORTHERN, AND SOUTHERN MARYLAND, AND CENTRAL, NORTHERN,
AND NORTHWEST VIRGINIA.
* WHEN...FROM 10 AM THIS MORNING TO 9 PM EDT THIS EVENING.
* IMPACTS...HEAT RELATED ILLNESSES INCREASE SIGNIFICANTLY DURING
EXTREME HEAT AND HIGH HUMIDITY EVENTS. HOT TEMPERATURES AND HIGH
HUMIDITY MAY CAUSE HEAT ILLNESSES.
* ADDITIONAL DETAILS...EARLY MORNING LOW TEMPERATURES IN THE 70S AND
80S COMBINED WITH OPPRESSIVE HUMIDITY WILL RESULT IN LITTLE TO NO
OVERNIGHT RELIEF. PROLONGED EXCESSIVE HEAT MAY IMPACT POWER,
WATER, AND TRANSPORTATION SYSTEMS. HEAT INDEX VALUES AROUND 100 TO
104 ARE POSSIBLE AGAIN SUNDAY AFTERNOON.
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.
DO NOT LEAVE YOUNG CHILDREN AND PETS IN UNATTENDED VEHICLES. CAR
INTERIORS WILL REACH LETHAL TEMPERATURES IN A MATTER OF MINUTES.
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.
MDZ502-VAZ025-026-504-WVZ502-504-506-041300-
/O.CON.KLWX.HT.Y.0007.260704T1400Z-260705T0000Z/
CENTRAL AND EASTERN ALLEGANY-AUGUSTA-ROCKINGHAM-EASTERN HIGHLAND-
EASTERN GRANT-EASTERN MINERAL-EASTERN PENDLETON-
1247 AM EDT SAT JUL 4 2026
...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 8 PM
EDT THIS EVENING...
* WHAT...HEAT INDEX VALUES UP TO 102 EXPECTED.
* WHERE...IN MARYLAND, CENTRAL AND EASTERN ALLEGANY COUNTY. IN
VIRGINIA, AUGUSTA, EASTERN HIGHLAND, AND ROCKINGHAM COUNTIES. IN
WEST VIRGINIA, EASTERN GRANT, EASTERN MINERAL, AND EASTERN
PENDLETON COUNTIES.
* WHEN...FROM 10 AM THIS MORNING TO 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.
BRO
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