Heat warning sign in Death Valley National Park, California
(Image credit: David McNew/Getty Images)

Temperatures in the Southwestern U.S. hit record-setting highs over the weekend, killing four in Arizona and fueling wildfires. An estimated 30 million people are currently under heat advisories, and parts of California, Arizona, and Nevada are facing "'red flag warnings' for extreme fire conditions," Reuters reports. There are already three large wildfires burning in the region.

In California, heat records were broken in 14 places, while in Arizona records were shattered in seven areas. In California's Palm Springs, Thermal, Indio, and Borrego, temperatures rose to as high as 117 degrees Fahrenheit Sunday. In Phoenix, it was 118 degrees Fahrenheit.

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