Extreme Heat Watch

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service Baltimore MD/Washington DC 812 PM EDT Sun Jun 22 2025 ...EXTREME HEAT WARNING REMAINS IN EFFECT FROM 11 AM TO 9 PM EDT MONDAY... ...EXTREME HEAT WATCH REMAINS IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY EVENING... ...HEAT ADVISORY HAS EXPIRED... * WHAT...For the Extreme Heat Warning, dangerously hot conditions with heat index values up to 110 expected. For the Extreme Heat Watch, dangerously hot conditions with heat index values up to 110 possible. * WHERE...In Maryland, Northwest Montgomery and Frederick MD Counties. In Virginia, Eastern Loudoun and Western Loudoun Counties. * WHEN...For the Extreme Heat Warning, from 11 AM to 9 PM EDT Monday. For the Extreme Heat Watch, from Tuesday morning through Tuesday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. 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.