Lori Mantz sprays water to cool down her horse Thor, Monday, June 19, 2017, in Las Vegas. The Southwestern U.S. is about to feel the wrath of a punishing heat wave that includes a forecast of 120 degrees in Phoenix — a temperature not seen in the desert city in more than 20 years. The broiling temperatures will also be felt in Las Vegas and Southern California, creating a public health hazard. (AP Photo/John Locher)
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