An outbreak of tornadoes occurred on April 21, 1967 across parts of the Midwest states. Per The Storm Prediction Center, there were 46 tornadoes. 5 were given a rating of F4: 1 in MO, 1 in MI and 3 in IL. This summary will focus on the 3 Illinois F4s. It is considered Northern Illinois' Worst Tornado Disaster.

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