Although the official start of summer is still two weeks away, roughly half of Arizona and Nevada were under an excessive heat alert, which the National Weather Service extended until Friday evening.
Temperatures will slowly retreat over the weekend, but will remain above normal into early next week. The National Weather Service in Phoenix, where the new record high of 113F on Thursday leap-frogged the old mark of 111F set in 2016, called the conditions dangerously hot.
At a campaign rally for Donald Trump in Phoenix, 11 people fell ill from heat exhaustion by late afternoon and were taken to the hospital. In Las Vegas, with a new record of 111F on Thursday, the Clark county fire department responded to at least 12 calls for heat exposure since midnight on Wednesday.
Several other areas of Arizona, California, and Nevada also broke records, illustrating the widespread impact of the heatwave.
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