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. The sae is completely covered with long white patches of foam. The air is filled with foam and spray. Sea completely white with driving spray. Visibility seriiuosly affected.