0 |
Flat. |
1 |
Ripples without crests. |
2 |
Small wavelets. Crests of glassy appearance, not breaking. |
3 |
Large wavelets. Crests begin to break; scattered whitecaps. |
4 |
Small waves. |
5 |
Moderate (1.2 m) longer waves. Some foam and spray. |
6 |
Large waves with foam crests and some spray. |
7 |
Sea heaps up and foam begins to streak. |
8 |
Moderately high waves with breaking crests forming spindrift. Streaks of foam. |
9 |
High waves (6-7 m) with dense foam. Wave crests start to roll over. Considerable spray. |
10 |
Very high waves. The sea surface is white and there is considerable tumbling. Visibility is reduced. |
11 |
Exceptionally high waves. |
12 |
Huge waves. Air filled with foam and spray. Sea completely white with driving spray. Visibility greatly reduced. |