 A dangerous heat wave in California as triple-digit temperatures threaten lives in the state. A historic heat wave searing the West, 158 million people under heat alerts. Well, we want to make sure that they're staying indoors between the hours of 10 and 3, stay hydrated and rested. Death Valley could clock a scalding 129 degrees, just five degrees shy of the hottest temperature ever recorded on Earth. ABC's Jacqueline Lee in Los Angeles.