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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.
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.
Dubbed the 1974 Super Outbreak, severe storms and 148 tornadoes claimed hundreds of lives and injured thousands more. The National Weather Service says 15,000 homes businesses and farm buildings ...
Part of the historic 2011 Super Outbreak, the largest tornado outbreak on record, this was the first of four EF5 tornadoes to touch down that day and the first such storm in Mississippi since the 1966 Candlestick Park tornado. While on the ground for 30 minutes, it traveled along a 28.28-mile (45.51 km) path through four counties, leaving ...
The long-track Mississippi–Alabama EF4 tornado was down from 2 hours, 53 minutes, the longest duration for a tornado in the outbreak. [7] The outbreak continued during the overnight and into the morning of April 28, with 47 more tornadoes occurring from Florida to New York. Most of the tornadoes very relatively weak and caused comparatively ...
It was the deadliest tornado of the 2011 Super Outbreak, the largest tornado outbreak in United States history. The second of four EF5 tornadoes to touch down on April 27, along with the Philadelphia, MS , Smithville, MS , and Rainsville, AL tornadoes; the tornado reached a maximum width of 1.25 miles (2.01 km) and was estimated to have had ...
The Super Tuesday outbreak of Feb. 5-6, 2008, had the most tornadoes for a single February event, with 86 confirmed over 10 states responsible for 57 tornado-related deaths. Five tornadoes were ...