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For example, the tornado frequency of Southwestern Ontario is about half that of the most tornado-prone areas of the central US plains. The last multiple tornado-related deaths in Canada were caused by a tornado in Ear Falls, Ontario on 9 July 2009, where 3 died, and the last killer tornado was on 21 June 2021 in Mascouche, Quebec. [49]
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.
Prior to 1950 in the United States, only significant tornadoes are listed for the number of tornadoes in outbreaks. Due to increasing detection, particularly in the U.S., numbers of counted tornadoes have increased markedly in recent decades although the number of actual tornadoes and counted significant tornadoes has not. In older events, the ...
The most powerful, or EF-5, have winds above 200 mph and usually cause catastrophic damage. The tornado that flattened a swath of Iowa in May was an EF-4 tornado, and one of the deadliest of 2024.
The deadliest tornado in modern U.S. history struck Joplin, Missouri, on May 22, 2011. It was the deadliest tornado since SPC records began in 1950. Nearly 1,000 were injured. The EF5 tornado had ...
The most active day for tornado reports was April 26, 2024, when a series of storms across the U.S. produced more than 100 tornadoes. Expensive and deadly: Near record number of tornadoes reported ...
The high risk was issued at 1630Z for a 30% probability of significant tornadoes. Although most of the tornadoes that touched down were relatively weak and short-lived, seven of them were more than 1 ⁄ 2 mi (0.80 km) wide, including one that reached a peak width of just over 1 + 1 ⁄ 4 mi (2.0 km) wide, and multiple tornado emergencies were ...
That figure is inflated somewhat by 2011, when one of the costliest and deadliest tornado outbreaks ever recorded claimed the lives of at least 553 people, including more than 150 in one Missouri ...