||Sea State Description
||Sea like a mirror
||“Ripples with the appearance of scales are formed but without foam crests.”
||“Small wavelets still short but more pronounced. Crests have a glassy appearance and do not break.”
||Large wavelets. Crests begin to break. Foam of glassy appearance. Scattered white horses.
||“Small waves becoming longer fairly frequent white horses.”
||“Moderate waves taking a more Pronounced long form; many white horses are formed. Chance of some spray.”
||Large waves begin to form; white foam crests are more extensive everywhere. Probably some spray.
||Sea heaps up and white foam from breaking waves begins to be blown in streaks along the direction of the wind.
||Moderately high waves of greater length; edges of crests begin to break into spindrift. The foam is blown in well-marked streaks along the direction of the wind.
||“High waves. Dense streaks of foam along the direction of the wind. Crests of waves begin to topple tumble and roll over. Spray may affect visibility.”
||“Very high waves with long over-hanging crests. The resulting foam in great patches is blown in dense white streaks along the direction of wind. On the whole the surface of the sea takes a white appearance. The ‘tumbling’ of the sea becomes heavy and shock-like. Visibility is affected”
||Exceptionally high waves (small & medium sized ships might be lost to view for a time behind the waves). The sea is completely covered with long white patches of foam lying along the direction of the wind. Every-where the edges of the wave crests are blown into froth. Visibility is affected.
||The air is filled with foam and spray. Sea completely white with driving spray; visibility very seriously affected