Crest begin to break. Fairly frequent white horses. Fresh Breeze Moderate waves, taking a more pronounced form. The foam is blown in well marked streaks along the direction of the wind. Dense streaks of foam.
Crests begin to topple, tumble and roll over.
Spray may affect visibility. Storm Very high waves with long overhanging crests. Foam in dense patches is blown in dense white streaks. Sea surface takes on a white appearance. Tumbling of the sea becomes heavy and shock-like.