What's a heat dome? Here's why so much of the US is broiling this week

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Much of the Midwest and the Northeast is broiling — or set to broil — in extreme summer heat this week.

NationalFILE - The unofficial temperature hits 108 degrees at dusk at Sky Harbor International Airport in Phoenix, on July 12, 2023. The U.S. last year saw the most heat waves since 1936, according to an Associated Press analysis of Centers for Disease Control and Prevention data. Both mean it's really hot — and people will hear those terms a lot more as the world heats up. What's the difference?It’s helpful to think of a heat dome as what’s happening in the atmosphere.

The combination of clear skies and the higher summertime angle of the sun can result in high heat index readings, a measure of temperature combined with humidity. Humidity makes the weather feel far hotter because the body cools itself by sweating and has to work harder when the air’s already moist. In Cincinnati, Ohio, Tuesday’s high will be around 96 F , but will feel like 104 F , according to the weather service. The high heat will continue through the weekend.

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