Theoreticaly, could there be a Cat 6?

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There is an F6 tornado

#41 Postby jimvb » Fri Jul 08, 2005 7:07 pm

I read somewhere that the ratings for tornadoes is:

F0 Gale, doubtful tornado, or maybe tornadillo
F1 Moderate Tornado
F2 Significant Tornado
F3 Severe Tornado
F4 Devastating Tornado
F5 Incredible Tornado
F6 Inconceivable Tornado

Further, no F6 tornado has ever occurred, although some have come close.

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#42 Postby senorpepr » Fri Jul 08, 2005 7:53 pm

After some research... I found the original Fujita scale. The scale we are used to today (F0-F6) is actually called the Fujita-Pearson Scale where Allen Pearson added more description to the original scale. Also, dropped were F7-F12, since the damage between F6 and F12 would look the same... a total mess.

Anyway... the original scale was to extend off the Beaufort Scale, a scale of 12 steps. F0 was to denote tornadoes below hurricane strength, or Forces 1-11 on the Beaufort Scale.

F0 - 40-72 mph
F1 - 73-112 mph
F2 - 113-157 mph
F3 - 158-206 mph
F4 - 207-260 mph
F5 - 261-318 mph
F6 - 319-379 mph
F7 - 380-440 mph
F8 - 441-506 mph
F9 - 507-579 mph
F10 - 577-651 mph
F11 - 652-731 mph
F12 - 732 mph - Mach 1

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