http://www.spc.noaa.gov/faq/tornado/ef-scale.html
The update to the scale, or the "Enhanced F-scale" will be implemented on February 1, 2007. An F-5 tornado will now be classified as any storm with a 3 second gust of over 200mph.
Also, an article from AP:
http://hosted.ap.org/dynamic/stories/T/ ... TE=DEFAULT
Change to Operational Fujita Scale introduced at AMS-Atlanta
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