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Illinois has had large tornado outbreaks in the past, including the tornado outbreak sequence of December 18–20, 1957 and the 1967 Oak Lawn tornado outbreak. Illinois is vulnerable to tornadoes with an average of 35 occurring annually, which puts much of the state at around 5 tornadoes per 10,000 square miles (30,000 km 2) annually. [1]
The 19th was the most prolific tornado outbreak in Illinois history with 33 tornadoes touching down across the state, breaking the old record of 25 set on August 10, 1974. [1] This outbreak can also be compared to the May 2004 tornado outbreak sequence as it was a very large, deep, and vigorous system.
The second deadly tornado to develop on December 18 became one of two tornadoes to strike Mount Vernon in Jefferson County, Illinois. The first tornado was the strongest and formed at 3:55 pm. CST (21:55 UTC) about 10 mi (16 km) west-southwest of downtown Mount Vernon, whence local police monitored its movement from patrol vehicles and ...
SPC storm reports for November 17, showing the extent of the tornado outbreak and subsequent wind event. With the overall upper-level system expected to track eastward across the United States High Plains on November 17, the SPC issued a slight risk for severe thunderstorm activity for an area surrounding the confluence of the Mississippi and Missouri rivers, valid for the early morning hours ...
In comparison, the first tornado emergency issued in 2022 didn't come until April 5. The other three tornado emergencies issued in Friday's severe weather outbreak traveled with a storm near Wynne ...
At 1:50 p.m. CDT (18:50 UTC), the SPC issued a tornado watch for northern and central Illinois, far northwestern Indiana, far southern Wisconsin, and portions of Lake Michigan. A 60% chance of two or more tornadoes was assessed across the watch box, with a 40% chance of at least one strong tornado. [8]
In addition to a possible tornado tearing into the town of Red Oak, Iowa, another suspected tornado was captured on camera just before 5:00 p.m. as it moved across a highway and ripped through ...
Drier air expanding across the Plains beginning on Friday, but especially during the upcoming weekend dates of May 11 and 12, will lead to a much quieter weather pattern across the region.