The posts in this forum are NOT official forecast and should not be used as such. They are just the opinion of the poster and may or may not be backed by sound meteorological data. They are NOT endorsed by any professional institution or storm2k.org. For official information, please refer to the NHC and NWS products.
Joined: Fri Aug 22, 2003 9:22 pm Posts: 13196 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.