Murphysboro, IL F4 Tornado – December 18, 1957

A total of 25 tornadoes occurred on December 17, 1957, all in Illinois or Missouri. Two were later rated F4 and 1 was given an F5 rating. In this summary, we look at an F4 that traveled close to 30 miles through parts of Jackson, Williamson and Franklin Counties in Illinois. Per Thomas Grazulis in Significant Tornadoes, the path followed closely to a section of the great Tri-State Tornado of March 18, 1925.

Canton, IL F3 Tornado – July 23, 1975

Fujita researched this tornado family and the influence that microbursts may have had on them. Per Grazulis, “Professor Fujita’s mapping of the Canton tornado family shows how microbursts and/or other downburst-type winds move the tornado from side to side and may influence its intensity. Microburst m2 might have caused the break in the path. Otherwise the event might have been a single tornado. Microburst m6 might have caused the tornado to intensify. Both deaths were in that area.” (Grazulis, 1178)

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