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Commonly accepted as the strongest tornado possible. According to Thomas Schlatter, the Fujita scale goes [all the way up] to F-12, which is winds [the speed of sound]. The article was actually written in Fune 1986 and was cited in the Jan/Feb 98 issue of the same periodical. Since before the original article was written in 1986, there has never been a documented tornado of F-6 or above, and the author states it's not likely to happen. James R. McDonald includes a table of Fujita levels and wind speeds. F-6 and above is labled as "inconcievable damage". Wind speed are as follows (in miles per hour): F-6 319-379 F-7 380-445 F-8 446-513 F-9 514-585 F-10 586-659 F-11 660-735 F-12 736 and above note: [The speed of sound] at -3ºC is 736 miles per hour.
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