The Fujita scale was created by and named after Ted Fujita. He created a scale to classify tornadoes in 1971 based on tornado reports from previous years. With new information and data, the scale was enhanced in 2007. Below is the comparison of the F scale and the new EF scale. The scale ranges from EF0 to EF5 giving meteorologists the ability to categorize a tornado.
|FUJITA SCALE||DERIVED EF SCALE||OPERATIONAL EF SCALE|
|F Number||Fastest 1/4-mile (mph)||3 Second Gust (mph)||EF Number||3 Second Gust (mph)||EF Number||3 Second Gust (mph)|
*** IMPORTANT NOTE ABOUT ENHANCED F-SCALE WINDS: The Enhanced F-scale still is a set of wind estimates (not measurements) based on damage. Its uses three-second gusts estimated at the point of damage based on a judgment of 8 levels of damage to the 28 indicators listed below. These estimates vary with height and exposure. Important: The 3 second gust is not the same wind as in standard surface observations. Standard measurements are taken by weather stations in open exposures, using a directly measured, "one minute mile" speed.