Authorities say the storm brought winds strong enough to blow over a semi trailer and hail the size of tennis balls. (CNN/STORMCHASINGVIDEO.COM)

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Tornado touches down in Illinois

Updated: Wednesday, 26 Sep 2012, 1:36 PM EDT
Published : Wednesday, 26 Sep 2012, 12:56 PM EDT

OKAWVILLE, Ill. (CNN) - Some dramatic video out of Illinois where storm chasers got a good look at a tornado.

It happened Tuesday evening near the town of Okawville, just outside Saint Louis.

Authorities say the storm brought winds strong enough to blow over a semi trailer and hail the size of tennis balls.

At least three houses were damaged by the storm.