Extreme Heat Warning

* WHAT...Dangerously hot conditions expected below 4000 feet, with daytime temperatures ranging from 93 to 97 degrees at Havasupai Gardens, to 106 to 110 degrees at Phantom Ranch.

* WHERE...Lower elevations of the Grand Canyon.

* WHEN...Until 8 PM MST this evening.

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