Erica's Answer:
Their intent was to more accurately assess the tornado's wind speed based on the damage the tornado had caused. However, the result has been more confusion than enlightenment! The new "EF" scale, or Enhanced Fujita scale, is as follows: EF Number 3 Second Gust (mph) 0 65-85 1 86-110 2 111-135 3 136-165 4 166-200 5 Over 200 The new EF scale, in general, contains lighter wind speeds than the original F scale. The damage scale remains basically unchanged, though; whether F5 or EF5, the "5" designation is still the top of the scale.- Erica