* WHAT…Dangerously hot conditions below 4000 feet, with daytime temperatures ranging from 103 degrees at Havasupai Gardens, to 112 degrees at Phantom Ranch. * WHERE…Lower elevations of the Grand Canyon. * WHEN…Until 8 PM MST Thursday. * IMPACTS…Most individuals will be at risk for heat-related illnesses without effective cooling or adequate hydration, especially with prolonged outdoor expo
Source: National Weather Service
Indexed: Wed, 17 Jun 2026 16:54:19 UTC
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