What caused the US heat wave?

A severe heat wave affecting 40 million Americans has seen temperatures over one hundred degrees Fahrenheit beat records in Wyoming, Utah, Arizona and Southern California, according to NBC News. It has two main causes, according to the Associated Press.First, a "heat dome," or area of high pressure. Sinking air from the Earth's atmosphere prevents air near the ground from rising. That sinking air operates like a cap, trapping warm ground air in place, according to the U.S. National Oceanic and Atmospheric Administration. Without rising air, there is also no rain, and nothing to stop hot air from becoming hotter. #California

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