Enhanced Fujita Tornado Scale
(EF scale)

...an update to the original F-scale by a team of meteorologists and wind engineers implemented in the U.S. in 2007.

FUJITA-PEARSON SCALE			OPERATIONAL EF SCALE
F Number	Fastest 1/4-mile (mph)	3-Second Gust (mph)	EF Number	3-Second Gust (mph)
0	40-72	45-78	0	65-85
1	73-112	79-117	1	86-110
2	113-157	118-161	2	111-135
3	158-207	162-209	3	136-165
4	208-260	210-261	4	166-200
5	261-318	262-317	5	Over 200

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.

Damage details of the Enhanced Fujita Scale (EF)

Beaufort Wind Scale

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Enhanced Fujita Tornado Scale (EF scale)

...an update to the original F-scale by a team of meteorologists and wind engineers implemented in the U.S. in 2007.

Enhanced Fujita Tornado Scale
(EF scale)