Heat wave creates severe storms throughout Midwest | USA TODAY

Dangerous, record-setting heat had nearly one-third of the U.S. population in its grip Tuesday – from the Upper Midwest to the Southeast – on the cusp of summer’s official arrival.

The National Weather Service issued excessive heat warnings, watches and heat advisories for more than 100 million people as temperatures were expected to surge 10 to 20 degrees above normal from the Plains, the Midwest and some areas along the East Coast, according to AccuWeather.