'A lid on a pot': How does a heat dome work?

Jun 25, 2025 - 00:07
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'A lid on a pot': How does a heat dome work?
A seven-day "HeatRisk" map from the National Integrated Heat Health Information System shows much of the eastern U.S. in the grip of a heat dome causing extreme high temperatures to linger.

"If you've made grilled cheese in a pan and you put a lid on there, it melts the cheese faster because the lid helps trap the heat," a National Weather Service official told NPR.

(Image credit: Esri, TomTom, Garmin, FAO, NOAA, USGS, EPA, USFWS)

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