||Sea like a mirror.
||Less than 1
||Ripples with the appearance of scales are formed but without foam crests.
||1 - 3
||Small wavelets, still short but more pronounced. Crests have a glassy appearance
and do not break.
||4 - 6
||Large wavelets. Crests begin to break. Foam of glassy appearance. Perhaps
scattered white horses.
||7 - 10
||Small waves, becoming longer, fairly frequent white horses.
||11 - 16
||Moderate waves, taking a more pronounced long form, many white horses are formed.
(Chance of some spray.)
||17 - 21
||Large waves begin to form; the white foam crests are more extensive everywhere.
(Probably some spray.)
||22 - 27
||Sea heaps up and white foam from breaking waves begins to be blown in streaks
along the direction of the wind.
||28 - 33
||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.
||34 - 40
||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.
||41 - 47
||Very high waves with long overhanging crests. The resulting foam in great patches
is blown in dense white streaks along the direction of the wind. On the whole the surface
of the sea takes a white appearance. The tumbling of the sea becomes heavy and shocklike.
||48 - 55
||Exceptionally high waves. (Small and medium-sized ships might be for a time lost
to view behind the waves.) The sea is completely covered with long patches of foam lying
along the direction of the wind. Everywhere the edges of the wave crests are blown into
froth. Visibilty affected.
||56 - 63
||The air is filled with foam and spray. Sea completely white with driving spray;
visibilty very seriously affected.