At least 70% of Americans will experience temperatures above 90F on the first day of summer

At least 70 percent of Americans are set to experience a severe heatwave that will see temperatures rise above 90F and even reach triple-digits across parts of the Gulf Coast, the Great Lakes and the Mid West on the official first day of summer.

Chicago, Minneapolis, Nashville, Memphis, Dallas, New Orleans and Atlanta are among several cities under excessive heat warnings, with temperatures forecasted to reach higher than 100F, affecting 20 percent of the US population — 67.9million people.  

Minneapolis and St. Louis in Minnesota saw local weather reach about 101F Monday (38C), accompanied by high humidity that made conditions feel close to 110F (43C).

The Twin Cities are seeing its roads cave in under the heat and two areas on I-35 in the Minneapolis area are now closed as of a…