About 40 million people from California to Texas are sweltering amid a dangerous heat wave that threatens to match or eclipse daily high-temperature records through the weekend.

Phoenix and Las Vegas reported record daily highs on Friday, according to the National Weather Service. Arizona’s capital city  reached 113 degrees, surpassing  its previous record of 111 set in 1978. Las Vegas hit 109, breaking the previous record, set in 1996, by 1 degree. 

And, in New Mexico, Albuquerque reached 100 degrees for the first time this year.

“It’s really the first big heat wave of the season,” NWS forecaster Bryan Jackson told USA TODAY on Friday. “It catches people off-guard.”