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!