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 ...
Type of outbreak | Weak | Minor | Significant | Major | Devastating | Historic | Super |
---|---|---|---|---|---|---|---|
Number of points |
2–6 | 7–10 | 11–29 | 30–79 | 80–119 | 120–249 | 250+ |
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Parts of this article (those related to pre-1970 outbreaks) need to be updated. (March 2024) |