|
Wind Force |
Wind Speed
Knots |
Wind Speed
m/s |
Wind Description |
Wave Height
m |
Sea State Description |
|
0 |
<1 |
0 - 0.2 |
Calm |
0 |
Like a mirror. |
|
1 |
1 - 3 |
0.3 - 1.5 |
Light air |
0.1 |
Ripples appearing like scales with glassy appearance. |
|
2 |
4 - 6 |
1.6 - 3.3 |
Light breeze |
0.2 |
Small wavelets with glassy appearance. |
|
3 |
7 - 10 |
3.4 - 5.4 |
Gentle breeze |
0.6 |
Large wavelets. Crests begin to break. |
|
4 |
11 - 16 |
5.5 - 7.9 |
Moderate breeze |
1 |
Small, longer waves. Fairly frequent white horses. |
|
5 |
17 - 21 |
8 - 10.7 |
Fresh breeze |
2 |
Moderate waves. Many white horses, some spray. |
|
6 |
22 - 27 |
10.8 - 13.8 |
Strong breeze |
3 |
Large waves forming. Foaming white crests and spray. |
|
7 |
28 - 33 |
13.9 - 17.1 |
Near gale |
4 |
Sea heaps up. White foam begins blowing in streaks. |
|
8 |
34 - 40 |
17.2 - 20.7 |
Gale |
5.5 |
Moderately high waves of greater length. Crests begin to break. Foam is blown in well-marked streaks. |
|
9 |
41 - 47 |
20.8 - 24.4 |
Strong gale |
7 |
High waves. Dense streaks of foam. Crests begin to topple, tumble and roll over. Spray affects visibility. |
|
10 |
48 - 55 |
24.5 - 28.4 |
Storm |
9 |
Very high waves, long over-hanging crests. Tumbling of sea becomes heavy and shock-like. |
|
11 |
56 - 63 |
28.5 - 32.6 |
Violent storm |
11.5 |
Exceptionally high waves with edges of crests blown into froth. Sea covered in foam. Visibility affected. |
|
12 |
>63 |
>32.6 |
Hurricane |
14 |
Air filled with foam and spray, sea completely white with driving spray. Visibility very seriously affected. |
