By John Dodge

By John Dodge

CHICAGO (CBS) — For nearly 90 minutes, Walker Ashley followed the violent storms that pulverized northern Illinois on Thursday evening.

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One tornado flattened the towns of Fairdale and Rochelle.

Two people were killed, at least 20 others were sent to the hospital with injuries and others remain unaccounted.

Ashley is a professor in the meteorology program at Northern Illinois University.

Here is what he saw:

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The two images (below) show the early formation of a tornado in Franklin Grove, Ill., about 10 miles to the west of Rochelle.  At the time the photos were taken, the tornado was about one-minute old.





The photos (below) show the huge “wedge” tornado north of Rochelle, Ill., along Interstate 39, near State Road 64. Wedge tornadoes are relatively rare in Illinois.

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