Definition
Codes wind-generated sea by significant wave height: 0 calm glassy with no waves, 1 calm rippled up to 0.1 metres, 2 smooth 0.1 to 0.5, 3 slight 0.5 to 1.25, 4 moderate 1.25 to 2.5, 5 rough 2.5 to 4, 6 very rough 4 to 6, 7 high 6 to 9, 8 very high 9 to 14, and 9 phenomenal over 14 metres. A separate Douglas code describes swell independently of the wind sea.
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