Here's what to know about the heat.
Briefly

The heat wave smothering the eastern U.S. is severe, with over 94 million under advisories and record-breaking temperatures in areas like Maine, Ohio, and New York as a heat dome lingers.
The high-pressure heat dome phenomenon is causing significant discomfort, prompting closures and advisories, with hot nights exacerbating the situation for those without air-conditioning.
Read at www.nytimes.com
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