Residents in the western U.S. are enduring a heat wave, with temperatures reaching dangerous levels across Washington, Oregon, Southern California, Nevada, and Arizona.

Temperatures are expected to reach triple digits in parts of the Inland Empire on Wednesday, parts of L.A. and Orange counties by Thursday

The peak of the heat wave is expected Thursday and Friday, the National Weather Service said. While it’s brought hotter temperatures than in recent weeks, it is not particularly extreme in terms of all-time Southern California highs. “This is definitely more normal heat for this time of year,” Sam Zuber, an NWS meteorologist said.