List of tornado outbreaks by outbreak intensity score information
Parts of this article (those related to pre-1970 outbreaks) need to be updated. Please help update this article to reflect recent events or newly available information.(March 2024)
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]
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+
^ abcGrazulis, Thomas P. (2023). Significant Tornadoes 1974–2022. St. Johnsbury, Vermont: The Tornado Project. ISBN 978-1-879362-01-7.
^Grazulis, Thomas (August 29, 2023). "The Outbreaks Section". Tornado Project. Archived from the original on August 29, 2023. Retrieved August 29, 2023.
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