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Joined: Fri Aug 22, 2003 9:22 pm Posts: 13190 Location: Misawa, Japan
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.