An early-season heatwave this week shattered numerous records in California and Arizona, with high temperatures stemming from a persistent heat dome over the West. Approximately 38 million people are under heat warnings, with conditions expected to spread eastward. Notable records included a high of 107°F in Palm Springs, the highest temperature recorded for March, and Indio reaching 108°F, which also set a March record. In Arizona, temperatures soared to 110°F in Yuma County, marking the hottest March temperature in U.S. history, while Phoenix reached 102°F, its earliest triple-digit day on record.
Las Vegas set a new March record of 95°F, and parts of Oregon, Idaho, and Wyoming experienced unusually warm weather, such as Boise hitting 80°F, the earliest date on record since 1875. The heat is expected to intensify, spreading into the Rocky Mountains and southern Plains, with temperatures predicted to be in the mid to upper 90s across Texas and reaching into the 80s in Colorado.
The heatwave, driven by a ridge of high pressure trapping hot air, raises concerns about wildfires due to extreme heat, strong winds, and low humidity. While the precise link between climate change and specific weather events is complex, it is understood that global warming will likely result in more frequent and intense heatwaves.
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