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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, 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.
One also touched down near Windsor, Ontario, site of an F3 tornado in the 1974 Super Outbreak. F3 tornadoes caused major damage near Clio and Thetford Center, with a fatality occurring at the latter of the two locations. Other strong tornadoes touched down in Minnesota and New England. (13 significant, 2 killer)
Several tornadoes from the outbreak were exceptionally long-tracked. Three tornadoes on April 27 travelled over 120 miles (190 km), with a fourth traversing 97 miles (156 km). Seven tornadoes–the Vilonia tornado on April 25 and six tornadoes on April 27–stayed on the ground for over an hour.
The 1974 Super Outbreak was the second-largest tornado outbreak on record for a single 24-hour period, just behind the 2011 Super Outbreak. It was also the most violent tornado outbreak ever recorded, with 30 violent (F4 or F5 rated) tornadoes confirmed.
Wednesday marks the 50th anniversary of the 1974 Super Outbreak, the 24-hour period between April 3 and April 4 during which 148 tornadoes touched down in 13 different states.
Tracks of the 1974 Super Outbreak's 147 known tornadoes in the United States and fatalities by county. This is the list of tornadoes confirmed that occurred during the record-breaking 1974 Super Outbreak tornado event that occurred on April 3–4, 1974 across the eastern half of the United States and in Ontario, Canada.
Both of these tornadoes would receive an F5 rating on the Fujita scale, and were two out of seven F5-rated tornadoes to touch down as part of the 1974 Super Outbreak, one of the largest tornado outbreaks in United States history. Each of the tornadoes claimed over fifteen lives, and would kill a combined total of fifty-five people, many in the ...
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