A late-season tornado outbreak hit Illinois Saturday, dropping at least 26 confirmed tornadoes and injuring more than two dozen people in the Prairie State.
The surprise swarm of twisters marked the most to hit Illinois during a single December calendar day on record. The Storm Prediction Center had issued a “slight” risk of severe weather that morning, warning that “the development of afternoon thunderstorms in this region seems likely, with [wind] shear… favoring discrete supercell storm structures.” Supercell thunderstorms are the most dangerous form, with rotating updrafts that are the precursor to tornadoes.
https://www.washingtonpost.com/weather/2018/12/03/rare-december-tornado-outbreak-injures-dozens-illinois/?noredirect=on&utm_term=.47e433705a05
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