Four people are dead in Arizona amid a dangerous heat wave that's extending to several Southwest states Three hikers in total, as well as a trainer, have died due to heat-related illnesses around the state Temperature records were shattered Sunday in dozens of cities in New Mexico, Arizona, Nevada and California Yuma, Arizona, hit 120 degrees; Phoenix hit 118 degrees; Palm Springs, California reached 118 degrees; and Burbank California, reached 109 degrees