I believe there was already a lengthy discussion on this subject. Both the F and the EF scale are based on the same thing, damage to buildings, etc. to rate tornadoes. The new scale simply took the new testing that we are able to do to allow for more consistent and better ratings of the damage. It also allowed us to realize that it doesn't take as high as winds as previously thought to cause some damage, so the wind speeds relative to the damage were changed...
__________________ Jayson Prentice -- Iowa State University Meteorology '09 -- KC0TQO
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