Heat Dome’s Extreme Heat and Humidity Triggers Alerts across Eastern U.S.

image via New Scientist

July 23, 2025, 4:45 PM

A heat dome is causing tens of millions of people in the eastern U.S. to swelter in extreme heat, with the worst conditions expected in the Ohio River Valley and the Eastern Seaboard. The heat wave, exacerbated by high humidity, is forecast to last at least a week and may lead to record-high overnight lows in the mid-Atlantic and Southeast. This phenomenon is becoming more common due to climate change, with cities experiencing more frequent heat streaks. If you live in an affected area, check out science-backed tips for staying healthy.

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