GTSPP(Global Temperature and Salinity Profile Programme)

About WMO Beaufort Code Table

Beaufort Code

Code	Appearance of sea if fetch and duraction of the blow have been sufficient to develop the sea fully	Description
00	Sea like a mirror	Calm
01	Ripples with the appearance of scales are formed, but without foam crests	Light air
02	Small wavelets; crests have a glassy appearance and do not break	Light breeze
03	Large wavelets; crests begin to break; foam of glassy appearance; perhaps scattered white horses	Gentle breeze
04	Small waves, becoming longer; fairly frequent white horses	Moderate breeze
05	Moderate waves; many white horses are formed (chance of some spray)	Fresh breeze
06	Large waves; white foam crests everywhere (probably some spray)	Strong breeze
07	Sea heaps up and white foam from breaking waves begins to be blown in streaks along the direction of the wind	Near gale
08	Moderately high waves; edges of crests begin to break into the spindrift; foam is blown in well-marked streaks along the direction of the wind	Gale
09	High waves; dense streaks of foam along wind; crests begin to topple, tumble and roll over; spray may affect visibility	Strong gale
10	Very high waves with long overhanging crests; foam in great patches blown in dense white streaks along wind; sea surface takes a white appearance; tumbling becomes heavy and shock-like; visibility affected	Storm
11	Exceptionally high waves (medium sized ships may be lost to view behind waves); sea covered with long white patches of foam lying along the wind; everywhere edges of crests are blown into froth; visibility affected	Violent storm
12	Air is filled with foam and spray; sea completely white with driving spray; visibility seriously affected	Hurricane