Heavy flag straight out and whipping. Calm Sea smooth and mirrorlike. Occasional white foam crests. Near gale Sea heaps up, and white foam from breaking waves begins to be blown in streaks along the direction of the wind. Foam in great patches is blown in dense white streaks along the direction of the wind.
Visibility is reduced.
64-72 Violent Exceptionally high waves. The sea is storm completely covered with long, white patches of foam lying along the direction of the wind. The air is filled with foam and spray. Visibility very much reduced. It is recommended to always reference specific sea heights and sea height limitations using meters or feet.