Extreme temperatures building across Central, Eastern US as heat dome bakes millions ahead of July 4

Extreme temperatures building across Central, Eastern US as heat dome bakes millions ahead of July 4

A massive, life-threatening heat dome is settling over parts of the Central U.S. before spreading eastward Wednesday. More than 230 million people will see temperatures above 90 degrees, while more than 41 million will experience triple-digit heat at some point from midweek through the holiday weekend. Air temperatures are expected to peak across parts of the Midwest including St. Louis, Chicago, and Detroit by Wednesday. Meanwhile, parts of the Mid-Atlantic and Northeast will likely see 100-degree temperatures by Thursday, with nighttime lows remaining in the 80s.