Beaufort Wind Scale details
|
Beaufort Scale Number
|
Description
|
Mean wind speed in knots
|
Mean wind speed in km/h
|
Illustration
|
|---|---|---|---|---|
|
0
|
Calm
|
<1
|
< 2
|
 |
|
1
|
Light
|
1-3
|
2 - 6
|
 |
|
2
|
4-6
|
7 - 12
|
 |
|
|
3
|
Moderate
|
7-10
|
13 - 19
|
 |
|
4
|
11-16
|
20 - 30
|
 |
|
|
5
|
Fresh
|
17-21
|
31 - 40
|
 |
|
6
|
Strong
|
22-27
|
41 - 51
|
 |
|
7
|
28-33
|
52 - 62
|
 |
|
|
8
|
Gale
|
34-40
|
63 - 75
|
 |
|
9
|
41-47
|
76 - 87
|
 |
|
|
10
|
Storm
|
48-55
|
88 - 103
|
 |
|
11
|
56-63
|
104 - 117
|
 |
|
|
12
|
Hurricane
|
>=64
|
>= 118
|
 |