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Tracks of the 1974 Super Outbreak's 147 known tornadoes in the United States and fatalities by county. This is the list of tornadoes confirmed that occurred during the record-breaking 1974 Super Outbreak tornado event that occurred on April 3–4, 1974 across the eastern half of the United States and in Ontario, Canada.
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 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.
Wednesday marks the 50th anniversary of the 1974 Super Outbreak, the 24-hour period between April 3 and April 4 during which 148 tornadoes touched down in 13 different states.
The super-tornado outbreak of April 3 and 4, 1974, was the worst in U.S. history, with 148 twisters touching down in 13 states. When it had ended 16 hours later, 330 people were dead and 5,484 ...
A destructive outbreak ended only 17 hours before the Super Outbreak began in the same areas. (10 significant, 3 violent, 4 killer) [114] 1974 Super Outbreak: April 3–4, 1974: Eastern United States – Ontario: 148: 315 fatalities: The second-largest and most violent tornado outbreak ever documented. At least 50 of them were killers.
The 2011 Super Outbreak was the largest tornado outbreak spawned by a single weather system in recorded history; it produced 367 tornadoes from April 25–28, with 223 of those in a single 24-hour period on April 27 from midnight to midnight CDT, [4] [11] fifteen of which were violent EF4–EF5 tornadoes. 348 deaths occurred in that outbreak, of which 324 were tornado related.
The end of April 2021 marks an entire decade since a severe weather event that the National Weather Service called "one of the most active, destructive, and deadly" in U.S. history for tornadoes ...