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Dangerous Heat Wave Scorches Southwestern U.S.
California and the Southwest have experienced hazardous and excessive heat warnings as summer officially begins.
Chris Mitchell sprays water on his face to cool off while wearing a Darth Vader costume along the Las Vegas Strip on June 20, 2017.
The first day of summer brought some of the worst heat the southwestern U.S. region has seen in years. Arizona, Nevada and California saw dramatic temperatures on Tuesday and researchers say heat waves like this one are going to grow more frequent.