Tuesday, April 21st 2026

Record-Breaking Heatwave Sweeps U.S. West, Scientists Link It to Climate Change


Record-Breaking Heatwave Sweeps U.S. West, Scientists Link It to Climate Change
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An intense and unusual heatwave has shattered temperature records across the western United States, with extreme conditions expected to persist and spread eastward.

Temperatures in desert regions near the California–Arizona border reached 44.4°C (112°F) on Friday, setting a new national record for March. The record-breaking readings were recorded in areas near Yuma and Martinez Lake in Arizona, as well as Winterhaven and Ogilby in California.

So far, at least 65 cities across states including Arizona, California, and Idaho have recorded new March temperature highs. In Death Valley, temperatures soared to 40°C, while San Francisco matched its all-time March record at 29°C—an unusual spike for the typically cool coastal city.

The National Weather Service has issued extreme heat warnings across large parts of the southwest, including Los Angeles and Las Vegas. Authorities have also warned residents against leaving children or pets inside vehicles due to the dangerous heat levels.

Climate scientists say the severity and timing of the heatwave are deeply concerning. The World Weather Attribution described the event as extremely rare—likely to occur only once every 500 years—and strongly linked it to human-induced climate change.

According to climate expert Friederike Otto of Imperial College London, such extreme temperatures would have been virtually impossible without global warming.

Scientists warn that rising global temperatures, largely driven by fossil fuel emissions, are pushing weather patterns into unprecedented extremes. The early arrival of such intense heat has also begun affecting ecosystems, with plants blooming prematurely and wildlife facing increasing stress.

Residents have expressed concern over the unusual weather patterns, noting that summer-like temperatures in March are becoming increasingly common.

Experts say the phenomenon highlights the urgent need for stronger climate policies, as extreme weather events continue to intensify worldwide.

 

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