A heat dome is baking the United States. Here’s why that’s so dangerous

June is the new July. Or maybe even August. At least it feels that way, as summer heat has already soared to record highs.

In the United States, West Coast residents sweltered earlier in the month as a high-pressure weather system called a heat dome trapped record-breaking high temperatures over the region (SN: 7/19/23). Now, another heat dome is bringing another wave of extreme heat to swaths of the Midwest and East Coast, with temperatures forecasted to reach close to 38° Celsius (100° Fahrenheit) in many cities.

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