338 WWUS75 KFGZ 221539 NPWFGZ URGENT - WEATHER MESSAGE National Weather Service Flagstaff AZ 839 AM MST Mon Jun 22 2026 AZZ006-240200- /O.CON.KFGZ.XH.W.0004.260622T1700Z-260624T0200Z/ Grand Canyon Country- Including the cities of Grand Canyon North Rim, Grand Canyon Village, Tusayan, and Supai 839 AM MST Mon Jun 22 2026 ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 7 PM MST TUESDAY BELOW 4000 FEET... * WHAT...Dangerously hot conditions expected below 4000 feet, with daytime temperatures ranging from 105 degrees at Havasupai Gardens, to 111 degrees at Phantom Ranch. * WHERE...Lower elevations of the Grand Canyon. * WHEN...Until 7 PM MST Tuesday. * 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... This warning is reserved for only the hottest days of the year and is issued when temperatures are expected to rise to dangerous levels. Day hikers on Bright Angel Trail should descend no farther than 1 1/2 miles from the upper trailhead. Between the hours of 10 AM and 4 PM, hikers should be out of the canyon or at Havasupai Gardens or Bright Angel campgrounds, physical activity is discouraged. All hikers should have adequate gear, including a wide-brimmed hat, sunscreen, salty snacks, sufficient water, and electrolyte mix. Doubling your calorie intake helps maintain your energy. Hike smart. 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. && $$ JJ