An outbreak of tornadoes occurred on April 21, 1967 across
Belvidere Tornado Memorial via Boone County Journal
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.