Beaufort scale
0
Calm
1
Light air
2
Light breeze
3
Gentle breeze
4
Moderate breeze
5
Fresh breeze
6
Strong breeze
7
High wind,
moderate gale,
near gale
8
Gale, fresh gale
9
Strong/severe
gale
10 Storm, whole gale
11 Violent storm
12 Hurricane force
26
m/s
kts
0 - 0.2
0 - 1
0.3 - 1.5
1 - 3
1.6 - 3.3
4 - 6
3.4 - 5.4
7 - 10
5.5 - 7.9
11 - 16
8.0 - 10.7
17 - 21
10.8 - 13.8
22 - 27
13.9 - 17.1
28 - 33
17.2 - 20.7
34 - 40
20.8 - 24.4
41 - 47
24.5 - 28.4
48 - 55
28.5 - 32.6
56 - 63
32.6
>63
mph
km/h
0 - 1
0 - 1
1 - 3
1 - 5
4 - 7
6 - 11
8 - 12
12 - 19
13 - 18
20 - 28
19 - 24
29 - 38
25 - 31
39 - 49
32 - 38
50 - 61
39 - 46
62 - 74
47 - 54
75 - 88
55 - 63
89 - 102
64 - 72
103 - 117
>72
>117
ft/min
0 - 58
59 - 314
315 - 668
669 - 1082
1083 - 1574
1575 - 2125
2126 - 2735
2736 - 3385
3386 - 4093
4094 - 4822
4823 - 5609
5610 - 6417
>6417