Storms build over Arizona after heat streak

Extreme Heat Warning

until SUN 8:00 PM MST, Buckeye/Avondale, Northwest Valley, Scottsdale/Paradise Valley, Gila River Valley, Deer Valley, Tonopah Desert, Yuma County, Central La Paz, Gila Bend, South Mountain/Ahwatukee, Cave Creek/New River, Aguila Valley, Southeast Yuma County, North Phoenix/Glendale, West Pinal County, Sonoran Desert Natl Monument, East Valley, Kofa, Southeast Valley/Queen Creek, Fountain Hills/East Mesa, Central Phoenix, San Carlos, Northwest Pinal County, Apache Junction/Gold Canyon, Parker Valley