Multiday extreme heat will surge across the American southwest into California and up the coast into British Columbia, producing dangerous daytime highs and unusually warm nights. The National Weather Service has issued heat advisories, watches, warnings and red-flag alerts. Temperature highs could exceed 110F (43C) in the desert southwest and top 100F across southern California, with potential to break local daily records in Los Angeles and Arizona. Forecasts include a heightened chance of thunderstorms, creating compounding risks of heat, fire and storm activity. Sustained overnight warmth—minimums not dropping below 70–80F—will reduce nighttime relief and complicate fire containment. Outdoor workers, unhoused people, children and seniors face the greatest hazards and need access to cooling and hydration.
The National Weather Service has issued a swath of heat advisories, watches and warnings, along with red-flag alerts, warning the public to prepare. This dangerous level of heat will pose a threat to anyone without effective cooling and adequate hydration, NWS forecasters said in an outlook issued on Wednesday, outlining temperature highs that could climb past 110F (43C) in the desert south-west and above 100F across southern California.
Widespread record warm overnight minimum temperatures are possible through the west, according to climate scientist Daniel Swain, who shared an analysis of the upcoming event on his website. High night-time temperatures will add challenges to containing fires that erupt and increase the dangers for people unable to access cooling. This heatwave may be most notable for sustained overnight warmth in some cases, Swain said, with minimum temperatures not dropping below 70-80F.
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