Extreme Heat Warning issued June 16 at 12:30AM MST until June 20 at 7:00PM MST by NWS Flagstaff AZ

* WHAT…Dangerously hot conditions below 4000 feet, with daytime
temperatures ranging from 102 degrees at Havasupai Gardens, to 114
degrees at Phantom Ranch.

* WHERE…Lower elevations of the Grand Canyon.

* WHEN…Until 7 PM MST Friday.

* IMPACTS…Most individuals will be at risk for heat-related
illnesses without effective cooling or adequate hydration,
especially with prolonged outdoor exposure.