Tornado EF Wind Scale

EF Scale for TORNADO Damage

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)

0

40-72

45-78

0

65-85

0

65-85

1

73-112

79-117

1

86-109

1

86-110

2

113-157

118-161

2

110-137

2

111-135

3

158-207

162-209

3

138-167

3

136-165

4

208-260

210-261

4

168-199

4

166-200

5

261-318

262-317

5

200-234

5

Over 200

*** 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.

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