The Brief Thursday brought dry, hot conditions to Arizona, where temperatures reached 114 degrees and missed the record daily high by one degree. An extreme heat warning remains active through Monday for southern and western Arizona deserts as highs peak at 117 degrees on Saturday. An extreme heat warning is in effect across the southern and western Arizona deserts through Monday, since temperatures will continue to climb through Saturday. Havasu Creek, within the Grand Canyon, is under a flash flood warning until 11:15 p.m., which threatens the Havasupai Reservation, Supai, and any backpackers in the canyon. These storms can cause interruptions in services, such as water, power, and gas," stated Captain Ashley Losch of the Glendale Fire Department.