May I have the Definition of an EFO tornado.

Since February 1, 2007, the EF scale has been used to rate tornados based on their estimated wind speed. An EF rating of 0 is the mildest type of tornado with wind gusts between 65 and 85mph. An EF1 has wind gusts of 86-110mph; EF2 has gusts of 111-135mph; EF3 has gusts of 136-165mph; EF4 has gusts of 166-200mph. The largest on the scale, an EF5, has gusts of wind over 200mph! The older Fujita Scale went from F0 (47-72mph) to F6 (319-379 mph).
Updated on Monday, February 06 2012 at 04:48AM EST
Collection: nws 

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