The Mysterious ‘Warming Hole’ in the Middle of the US

Last month, a strange atmospheric phenomenon spread over the central United States: a brutal, self-perpetuating “heat dome.” Hot air descended onto the region, sucking the moisture out of soils and plants, and raising ground temperatures higher and higher. On August 23, Chicago hit a heat index (temperature combined with humidity) of 116 degrees Fahrenheit.

Stranger still? This was really out of character for the central US. Unlike the western and eastern parts of the country, daytime summer temperatures haven’t really warmed here since the mid-20th century. Scientists call this a “warming hole”—a blip in the overall heating trend across the US. But that doesn’t mean global warming has somehow skipped

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