An outbreak of 30 tornadoes occurred on August 19, 2009. The strongest was rated EF3 and tracked just over 24 miles through parts of Sangamon and Logan Counties in Illinois.
It was a family of small tornadoes amidst straight line winds that covered a good 70 miles through parts of Lee, DeKalb, Kendall and Will Counties in Illinois on August 15, 1958. The SPC officially has this listed as one tornado with a path length of 74.5 miles. It was given a rating of F2.
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)
An F4 tornado developed rapidly in a highly unstable atmosphere and devastated everything along its 9.6 mile path through Woodford County, IL on July 13, 2004. It began 1.75 miles NNE of Metamora and traveled generally in a southeasterly direction. The tornado reached F4 intensity as it crossed Route 117 and demolished the Parsons Manufacturing Plant.
In the SPC Database, this tornado is listed with an 8.8 mile path passing through parts of Schuyler County. Most of the impacts were in the towns of Littleton and Ray. The Storm Data Narrative and Thomas Grazulis in Significant Tornadoes indicate this was one of a family of tornadoes that covered much more ground.
Per the Storm Prediction Center Database, there were 12 tornadoes confirmed on June 14, 1957. The strongest of the day is the topic of this summary. It tracked through the southeastern part of Springfield, IL near Jerome and was later rated F4.
This F4 tornado began south of Niota in Hancock County, IL and traveled 50 miles through Henderson into Warren County where it dissipated 6 miles SW of Abingdon.
An F4 tornado traveled 70 miles from NW of Essex, IL to just west of Medaryville, IN on this day in 1963. Per Thomas Grazulis in Significant Tornadoes, “In Illinois, damage was near-F5 as several houses literally vanished.”
Per the SPC Database, 48 tornadoes occurred on March 20, 1976. Three were rated F4. In this summary, we will look at the first F4 of the day. It occurred during the early afternoon in Macon, Piatt, Champaign and Vermillion Counties in Illinois. The path length was 63.7 miles and the max width 800 yards. There were 18 reported injuries.
15 tornadoes occurred on March 11, 2006. Half of them where in the state of Missouri. We look at one of the strongest for the day and the event where fatalities occurred.