Extreme Heat Warning

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service Flagstaff AZ 145 AM MST Thu Jul 23 2026 ...EXTREME HEAT WARNING IN EFFECT FROM 10 AM MST /11 AM MDT/ FRIDAY TO 8 PM MST /9 PM MDT/ SUNDAY... * WHAT...Dangerously hot conditions, with daytime temperatures 105 to 110 expected. * WHERE...Marble and Glen Canyons. * WHEN...From 10 AM MST /11 AM MDT/ Friday to 8 PM MST /9 PM MDT/ Sunday. * IMPACTS...Most individuals will be at risk for heat-related illnesses without effective cooling or adequate hydration, especially with prolonged outdoor exposure. 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 action when you see symptoms of heat exhaustion and heat stroke. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. Stay cool, stay hydrated, stay informed.