|FUJITA-PEARSON SCALE||OPERATIONAL EF SCALE|
|F Number||Fastest 1/4-mile (mph)||3-Second Gust (mph)||EF Number||3-Second Gust (mph)|
IMPORTANT NOTE ABOUT ENHANCED F-SCALE WINDS: The Enhanced F-scale is still a set of wind estimates (not measurements) based on damage. Its uses 3-second gusts estimated at the point of damage.
These estimates vary with height and exposure.
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.