36
* It is strongly advised to manually turn on your Manual Stop Switch during periods of high winds (upwards
of Beaufort Wind Scale 7). Please refer to Sec. 3.2 for detailed information
APPENDIX B BEAUFORT WIND SCALE
Beaufort
No.
Description
Calm
Avg. Wind
Speed (knot/h)
Avg. Wind
Speed (km/h)
Avg. Wind
Speed (m/s)
Avg. Wind
Speed (mi/h)
image
0
Clam
<1
<2
<0.55
< 1.24
1
Light air
1 – 3
2 - 6
0.55~1.66
1.24~3.73
2
Light breeze
4 – 6
7 – 12
1.95~3.33
4.35~7.46
3
Gentle
breeze
7 – 10
13 – 19
3.61~5.27
8.08~11.81
4
Moderate
breeze
11 – 16
20 – 30
5.55-8.33
12.43~18.64
5
Fresh breeze
17 – 21
31 – 40
8.61-11.11
19.26~24.85
6
Strong breeze
22 – 27
41 – 51
11.38~14.16
25.48~31.69
7
Moderate gale
28 – 33
52 – 62
14.45~17.22
32.31~38.53
8
Fresh gale
34 – 40
63 – 75
17.5~20.83
39.15~46.60
9
Strong gale
41 – 47
76 – 87
21.11~24.16
47.22~54.06
10
Storm
48 – 55
88 – 103
24.44~28.61
54.68~64.00
11
Violent storm
56 – 63
104 – 117
28.88~32.5
64.62~72.70
12
Hurricane
≥ 64
≥ 118
>32.77
> 73.32
