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Weather & Science

Heat Dome Bakes Midwest Like a Giant Oven, Breaking Records

  • US has seen more than 1,853 heat records broken in past 7 days
  • Wind, hail and thunderstorms risk rises in Rochester and Utica
People take a break in the shade during a heatwave in downtown Chicago, on June 14. 

People take a break in the shade during a heatwave in downtown Chicago, on June 14. 

Photographer: Vincent D. Johnson/Xinhua/Getty Images

Cool and stormy weather at the corners of the US are helping trap heat across the Midwest and Mississippi Valley, where daily weather records are toppling as baking temperatures linger.

Low pressure systems in the Pacific Northwest and across northern New England have helped pin a high pressure dome over the central US that amplifies heat like a magnifying glass over the region. The US has seen 1,853 daily weather records fall for daytime highs and overnight warmth in the last seven days, according to data from the US National Centers for Environmental Information. Denver and Chicago were among cities that set new record highs earlier in the week.