USER
MANUAL
817NG
U
SE
B.55
7845282-06 03/20
subject to change without notice
The following table shows the Beafort scale and its wind speed ranges.
BEAUFORT SCALE
Wind
Symbol
Wind speed
Beaufort
force
Effect
m/s
km/h
Calm
0 - 0.2
0 - 1
0
Smoke rises vertically
Light air
0.3 - 1.5
1 - 5
1
Smoke drifts slightly
Light breeze
1.6 - 3.3
6 - 11
2
Leaves rustle
Wind vane moves
Gentle breeze
3.4 - 5.4
12 - 19
3
Leaves-constant motion
Light flag extended
Moderate breeze
5.5 - 7.9
20 - 28
4
Raises dust and papers
Small branches stir
Fresh breeze
8.0 - 10.7
29 - 38
5
Small trees sway
Strong breeze
10.8 - 13.8
39 - 49
6
Large branches move
Use of umbrella difficult
Moderate gale
13.9 - 17.1
50 - 61
7
Whole trees in motion
Fresh gale
17.2 - 20.7
62 - 74
8
Twigs broken off trees
Difficult to drive a car
Strong gale
20.8 - 24.4
75 - 88
9
Slight structure damage occurs
Whole gale
24.5 - 28.4
89 - 102
10
Trees uprooted
Severe structural damage