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Fujita Scale for Tornadic Activity
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FUJITA SCALE
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DERIVED EF SCALE
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OPERATIONAL
EF SCALE
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| 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 eight levels of damage to many indicators. These estimates vary with height and exposure. The three 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.
Storm Information:
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