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List of tornado outbreaks by Outbreak Intensity Score

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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 number of total points determine the rating for the outbreak, which is broken up into seven categories.[1]

More information Type of outbreak, Weak ...

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Super Outbreaks

There have been three tornado outbreaks which scored more than 250 points on the OIS, reaching the status of "Super Outbreak".[1]

More information Outbreak, OIS score ...

Historic Outbreaks

There have been 44 tornado outbreaks which scored at least 120 points, but less than 249 on the OIS, reaching the status of "Historic Outbreak".[1]

More information Outbreak, OIS score ...

Devastating Outbreaks

There have been several tornado outbreaks which scored at least 80 points, but less than 120 on the OIS, reaching the status of "Devastating Outbreak".[1]

More information Outbreak, OIS score ...

Major Outbreaks

There have been several tornado outbreaks which scored at least 30 points, but 79 or less on the OIS, reaching the status of "Major Outbreak".[1]

More information Outbreak, OIS score ...
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