173 WWUS71 KLWX 041307 NPWLWX URGENT - WEATHER MESSAGE National Weather Service Baltimore MD/Washington DC 907 AM EDT Sat Jul 4 2026 DCZ001-MDZ004>006-008-011-013-014-016>018-503>508-VAZ036>040-050-051-053>057-501-502-505-506-526-527-042115- /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-907 AM EDT Sat Jul 4 2026 ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 9 PM EDT THIS EVENING... * WHAT...Dangerously hot conditions with heat index values of 110 to 115. * WHERE...Washington DC, and portions of central, north central, northeast, northern, and southern Maryland, and central, northern, and northwest Virginia. * WHEN...Until 9 PM EDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Prolonged excessive heat may impact power, water, and transportation systems. Heat index values around 100 to 105 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. && $$ MDZ003-VAZ027>031-WVZ050>053-055-042115- /O.CON.KLWX.XH.W.0004.260704T1400Z-260705T0000Z/ Washington-Shenandoah-Frederick-Page-Warren-Clarke-Hampshire- Morgan-Berkeley-Jefferson-Hardy-907 AM EDT Sat Jul 4 2026 ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Dangerously hot conditions with heat index values up to 105 to 109 expected. * WHERE...Portions of north central Maryland, northwest Virginia, and eastern West Virginia. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Prolonged excessive heat may impact power, water, and transportation systems. Heat index values of 95 to 100 are possible again Sunday afternoon. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. && $$ MDZ502-VAZ025-026-504-WVZ502-504-506-042115- /O.CON.KLWX.HT.Y.0007.260704T1400Z-260705T0000Z/ Central and Eastern Allegany-Augusta-Rockingham-Eastern Highland- Eastern Grant-Eastern Mineral-Eastern Pendleton-907 AM EDT Sat Jul 4 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 104 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...Until 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...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. 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. && $$ DHOF