List of tornado outbreaks by outbreak intensity score

In late 2023, American meteorologist and tornado expert Thomas P. Grazulis created the Outbreak Intensity Score (OIS) as a way to rank tornado outbreaks. 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. The number of total points determine the rating for the outbreak, which is broken up into seven categories.

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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