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1985 United States–Canada tornado outbreak: May 31, 1985: U.S. – Canadian Eastern Great Lakes: 44: 90 fatalities: Unusual tornado outbreak was among the most intense recorded, the largest such outbreak in the region. Violent tornadoes devastated towns in Ohio, Pennsylvania, New York, and Ontario. Long-track tornado produced F5 damage in ...
In late 2023, American meteorologist and tornado expert Thomas P. Grazulis created the Outbreak Intensity Score (OIS) as a way to rank tornado outbreaks. [1] [2] For the score, only significant tornadoes are counted: F2/EF2 tornadoes receive 2 points each, F3/EF3 tornadoes receive 5 points each, F4/EF4 tornadoes receive 10 points each, and F5/EF5 tornadoes receive 15 points each. [1]
The 2011 Super Outbreak was the largest tornado outbreak spawned by a single weather system in recorded history; it produced 367 tornadoes from April 25–28, with 223 of those in a single 24-hour period on April 27 from midnight to midnight CDT, [4] [11] fifteen of which were violent EF4–EF5 tornadoes. 348 deaths occurred in that outbreak, of which 324 were tornado related.
The deadliest tornado in modern U.S. history struck Joplin, Missouri, on May 22, 2011. It was the deadliest tornado since SPC records began in 1950. Nearly 1,000 were injured. The EF5 tornado had ...
The 2011 Super Outbreak was the largest, costliest, and one of the deadliest tornado outbreaks ever recorded, taking place in the Southern, Midwestern, and Northeastern United States from April 25 to 28, 2011, leaving catastrophic destruction in its wake.
List of tornadoes in the 1985 United States-Canada tornado outbreak, (Grazulis, p. 1,268) Wilburton—Keota—Sallisaw, Oklahoma: 1960 May 5: 16 106 F4 May 1960 tornado outbreak sequence: Mount Carmel, Illinois: 1877 June 4: 16 100 F4 Some historical accounts suggest as many as 30 fatalities but this is unconfirmed. (Grazulis, p. 588)
When the largest tornado outbreak to affect the country since 2021 struck the Midwest and Southeast on March 31, 2023, one Iowa school district faced a tough decision: send the students home early ...
Number of tornadoes in United States by year and intensity. United States tornadoes by year [1] [2] Year Number of tornadoes FU/EFU F0/EF0 F1/EF1 F2/EF2 F3/EF3