Extreme Heat Watch

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service Baltimore MD/Washington DC 853 PM EDT Mon Jun 23 2025 ...EXTREME HEAT WARNING REMAINS IN EFFECT FROM 11 AM TO 9 PM EDT TUESDAY... ...EXTREME HEAT WATCH IN EFFECT FROM WEDNESDAY MORNING THROUGH WEDNESDAY EVENING... ...EXTREME HEAT WARNING WILL EXPIRE AT 9 PM EDT THIS EVENING... * WHAT...For the Extreme Heat Warning, dangerously hot conditions with heat index values up to 111 expected. For the Extreme Heat Watch, dangerously hot conditions with heat index values up to 110 possible. * WHERE...DC and portions of central, north central, northeast, northern, and southern Maryland, and central and northern Virginia. * WHEN...For the Extreme Heat Warning, from 11 AM to 9 PM EDT Tuesday. For the Extreme Heat Watch, from Wednesday morning through Wednesday 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.