Tornado outbreak

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A tornado outbreak is the occurrence of multiple tornadoes spawned by the same synoptic scale weather system. The number of tornadoes required to qualify as an outbreak are typically at least six to ten, with at least two rotational locations (if squall line) or at least two supercells producing multiple tornadoes.

Excerpt from the Wikipedia article “Tornado outbreak”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: From the National Weather Service, Courtesy of Ted Fujita (actual image link archive link) Hoxit, Lee R.; Charles F. Chappell (October, 1975) NOAA Technical Report: Tornado Outbreak of April 3-4, 1974; Synoptic Analysis, Category:Boulder, Colorado: U.S. Department of Commerce, p. iv NOAA TR ERL 338-APCL 37, Public domain, via Wikimedia Commons.