"The rain started coming, the skies got black, the wind was insane, and they evacuated us to underneath the concrete concourse," said Jim Arnold, who was at the game with his 11-year-old daughter.

"We've been through 15-degree-below weather and winds, but never anything like this," Arnold said. "The winds gusted at 70 mph, and the winds and the rain were horizontal and everybody was running. It was just crazy."

Fans returned to their seats and the game resumed mid-afternoon after the storm passed.

But other parts of the region still faced the threat of more severe weather, forecasters warned.

"These storms having been moving so fast today, it's been hard to keep up," said storm chaser Tony Laubach, who spoke to CNN as he watched a tornado touch down outside Lebanon, Indiana.

In Illinois, two deaths were reported in Nashville; one in Washington; one near Brookport; and one near Unionville, according to officials.

Monken said there were at least 11 confirmed tornado touchdowns, and officials there expect the number of storm-related injuries to grow.

In Oak Lawn, a wind gust of 86 mph was recorded as a severe thunderstorm rolled through the area.

At least six trucks overturned on highways about 80 miles west of Chicago due to high winds, the Ogle County Sheriff's Office said.

In a Twitter post, Indiana State Police shared a photo of twisted metal, piles of debris and the shell of a school building.

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