BORREGO SPRINGS, CALIFORNIA - MARCH 23: A sign reads "Danger Extreme Heat Conditions Ahead" in Anza-Borrego Desert State Park, which is threatened by climate change, on March 23, 2022 near Borrego Springs, California. A 2021 UC Irvine study found that native vegetation declined close to 40 percent from 1984 to 2017 in California’s Colorado Desert region which includes the park. Researchers concluded that drought and ‘new temperature extremes’ of increased heat in the summer contributed to the vegetation die off. (Photo by Mario Tama/Getty Images)

(AP) – Phoenix, Las Vegas, Denver and California’s Death Valley have all posted record temperatures as dangerous heat sweeps over the American Southwest. The National Weather Service in Phoenix reported a temperature of 114 degrees Fahrenheit on Saturday, tying the record high for the date set back in 1918. Las Vegas tied a record for the day set in 1956, with temperatures soaring to 109 F. In Colorado, Denver hit 100 F (38 C), tying a record set in 2013 for both the high temperature and the earliest calendar day to reach 100 F. Excessive heat warnings and heat advisories were also issued for parts of Northern California through the Central Valley and down to the southeastern deserts.