The temperature in New York City has reached 100 degrees as the eastern U.S. sweltered under an extreme heat wave.

Large swaths of the country were broiling under a heat dome, worsened by a humid atmosphere that’s circling the East.

A long-lasting extreme heat wave is reaching its dangerous crescendo Tuesday, likely bringing the hottest day in a decade to some major East Coast cities and putting millions of already fatigued Americans at risk.