wind / tornado scales

Beaufort Wind Scale and F-scale for Tornados


BEAUFORT WIND SCALE
Beaufort number           Effects               Wind conditions
0  smoke rises vertically from chimneys calm,less than 1 km/h
1   smoke from chimneys is deflectedlight breeze from 1 to 5 km/h
2  moves a weather vane light breezefrom 6 to 11 km/h
3  makes a flag fly light breezefrom 12 to 19 km/h
4  flutters papers and move small tree branchesmoderate breeze, 20 to 28 km/h
5  creates waves on a lake and moves bushes breezefrom 29 to 38 km/h
6  makes an umbrella difficult to use andwind from 39 to 49 km/h
     moves large branches
7  walking becomes difficultwind from 50 to 61 km/h
8  breaks small brancheswind from 62 to 74 km/h
9  lifts shingles on roofswind from 75 to 88 km/h
10 uproots trees and causes property damagewind from 89 to 102 km/h
11 storm causing heavy damage,wind from 103 to 118 km/h
     very rare conditions
12 hurricane causing devastationwind from 119 to 220 km/h


FUJITA OR F-SCALE OF TORNADO STRENGTH
F-scale Wind speed (km/h) Damage
F0 64 to 116 km/h little damage
F1 117 to 180 km/h moderate damage
F2 181 to 253 km/h considerable damage
F3 254 to 331 km/h severe damage
F4 332 to 418 km/h site devastated
F5 419 to 512 km/h unbelievable damage!

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