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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.
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]
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.
Late-May 1998 tornado outbreak and derecho; Tornado outbreak sequence of May 2004; List of tornadoes in the May 2004 tornado outbreak sequence; Southern Ontario tornado outbreak of 2005; List of tornadoes in the outbreak of May 22–27, 2008; Southern Ontario Tornado Outbreak of 2009; Tornado outbreak of June 5–6, 2010; 2011 Super Outbreak ...
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.
April 3 - Windsor, Ontario, was hit with an F3 tornado, part of the 1974 Super Outbreak. Nine people were killed and 30 were injured, with an estimated $500,000 in damage. It is listed as the sixth deadliest tornado in Canadian history. [594] 1975
The same storm system spawned an outbreak of fourteen confirmed tornadoes [19] mostly concentrated north of Peterborough in the Haliburton, Kawartha and Madawaska areas, which damaged cottages in the area, some severely. It was the most tornadoes confirmed in Ontario in a single 24-hour span day since 1985 and matched the annual provincial average.
The 1985 United States–Canada tornado outbreak, referred to as the Barrie tornado outbreak in Canada, was a major tornado outbreak that occurred in Ohio, Pennsylvania, New York, and Ontario, on May 31, 1985. In all 44 tornadoes were counted including 14 [2] in Ontario, Canada. It is the largest and most intense tornado outbreak ever to hit ...