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Since its initial usage in May 1999, the National Weather Service (NWS) in the United States has used the tornado emergency bulletin — a high-end classification of tornado warning — sent through either the issuance of a warning or via a "severe weather statement" that provides updated information on an ongoing warning—that is issued when a violent tornado (confirmed by radar or ground ...
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.
Tracking 46.36 mi (74.61 km) across four counties in Illinois, [151] the EF4 tornado that caused major damage in Washington, Illinois was the strongest tornado documented in the state for the month of November since reliable records began in 1950. [152] Up until that point, two other tornadoes in 1988 and 1991 were the strongest for that month ...
613 deaths in Southern Illinois. 695 deaths overall Deadliest single tornado in US history. Most extreme tornado in recorded history. Holds the record longest path length (219 miles, 352 km), longest duration (about 3.5 hours), and fastest forward speed for a significant tornado (73 mph, 117 km/h).
Tornado outbreak of June 5–6, 2010; 2010 New Year's Eve tornado outbreak; Tornado outbreak of April 14–16, 2011; Tornado outbreak sequence of April 19–24, 2011; 2011 St. Louis tornado; Tornado outbreak of June 18–22, 2011; 2012 Leap Day tornado outbreak; 2013 Washington, Illinois, tornado; Tornado outbreak of May 18–21, 2013; Tornado ...
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The Tornado outbreak of April 25–27, 1994 was a widespread tornado outbreak that affected much of the Central and Southern Plains of the United States as well as the Midwest and the Deep South from Colorado to New York from April 25 to April 27, 1994.