NWS / NOAA weather: Extreme Heat Warning issued July 6 at 2:35PM MST until July 8 at 8:00PM MST by NWS Flagstaff AZ

* WHAT...For the Extreme Heat Warning below 4000 feet, dangerously
hot conditions below 4000 feet, with daytime temperatures ranging
from 99 degrees at Havasupai Gardens, to 113 degrees at Phantom
Ranch. For the Extreme Heat Watch below 4000 feet, dangerously hot
conditions possible below 4000 feet, with daytime temperatures
ranging from 98 degrees at Havasupai Gardens, to 113 degrees at
Phantom Ranch.

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

* WHEN...For the Extreme Heat Warning, until 8 PM MST Wednesday. For
the Extreme Heat Watch, from Wednesday evening through Saturday
evening.

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

Source: NWS / NOAA weather.