10s Of Millions Face Deadly Conditions In Rare June Heatwave; Indices In The Low Hundreds In Multiple Cities
Tens of millions of people across the midwest and east braced on Sunday for another sweltering day of dangerously hot temperatures as a rare June heatwave continued to grip parts of the US. Most of the north-eastern quadrant of the country from Minnesota to Maine was under some type of heat advisory on Sunday. So were parts of Arkansas, Tennessee, Louisiana and Mississippi.
The temperature had already reached 80F (26.6C) in the Chicago area by 7.30am on Sunday, according to the National Weather Service. Forecasts called for heat indices of between 100 and 105F. The heat index in Pittsburgh was expected to top 105F. The temperature in Columbus, Ohio, was 77F at 8.30am. Highs there were expected to reach 97F with a heat index around 104F.
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The heat is expected to persist into the coming week, with the hottest temperatures shifting eastward. New York City is expected to see highs around 95F on Monday and Tuesday. Boston is on track for highs approaching 100F on Tuesday, and temperatures in Washington DC were expected to hit 100F on Tuesday and Wednesday.
Meteorologists say a phenomenon known as a heat dome, a large area of high pressure in the upper atmosphere that traps heat and humidity, is responsible for the extreme temperatures. Mark Gehring, a National Weather Service meteorologist in Sullivan, Wisconsin, said this level of heat is not uncommon during the summer months in the US, although it usually takes hold in mid-July or early August. The most unusual facet of this heatwave is the sheer amount of territory sweltering under it, he said.
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https://www.theguardian.com/us-news/2025/jun/22/midwest-east-coast-heatwave-temperatures
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