Extreme Heat Watch issued June 12 at 4:39AM MST until June 15 at 7:00PM MST by NWS Flagstaff AZ

* WHAT…Dangerously hot conditions possible below 4000 feet, with
daytime temperatures ranging from 103 degrees at Havasupai
Gardens, to 109 degrees at Phantom Ranch.

* WHERE…Lower Elevations of the Grand Canyon.

* WHEN…From Saturday morning through Sunday evening.

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

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