Extreme Heat Warning

until FRI 8:00 PM MST, Marble and Glen Canyons, Grand Canyon Country

Extreme Heat Warning

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

until THU 10:00 PM MST, Mohave County

until THU 10:15 PM MST, Cochise County

Grand Canyon admission fees waived

Published August 25, 2015 6:11 AM MST

Published August 25, 2015 6:11 AM MST

GRAND CANYON, Ariz. (KSAZ) - The National Park Service is celebrating its 99th birthday on Tuesday and they are giving you a present.

Admission at the Grand Canyon is free in honor of the birthday celebration.