Massive 'heat dome' is bringing 'extremely dangerous' temperatures to the eastern half of the US

A photograph of the New York City skyline at sunrise before a major heat wave.

The heatwave is expected to hit New York City and many other areas on the East Coast next week. (Image credit: Gary Hershorn/Contributor via Getty Images)

A major heat wave is set to scorch the central and eastern U.S., with millions of Americans facing potentially record-breaking extreme heat.

Temperatures and humidity will rise as much of the country finds itself under a "heat dome," traps warm air beneath, effectively like placing a lid on top of a pot.

"Heat is likely to reach dangerous levels over much of the Central and Eastern U.S.," an NWS representative wrote in a AccuWeather reported in a forecast.

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