Beaufort Scale
Beaufort |
Windspeed |
Avg Wave Height | Description |
Sea Condition |
---|---|---|---|---|
0 |
0 feet |
Calm | Sea like a mirror | |
1 - 3 |
< 1/2 |
Light Air | Ripples but without foam crests | |
4 - 6 |
1/2 ft |
Light Breeze | Small wavelets. Crests do not break | |
7 - 10 |
2 ft |
Gentle Breeze | Large wavelets. Perhaps scattered white horses | |
11 - 16 |
3 ft |
Moderate Breeze | Small waves. Fairly frequent white horses. | |
17 - 21 |
6 ft |
Fresh Breeze | Moderate waves, many white horses | |
22 - 27 |
9 ft |
Strong Breeze | Large waves begin to form; white foam crests, probably spray | |
28 - 33 |
13 ft |
Near Gale | Sea heaps up and white foam blown in streaks along the direction of the wind | |
34 - 40 |
18 ft |
Gale | Moderately high waves, crests begin to break into spindrift | |
41 - 47 |
23 ft |
Strong Gale | High waves. Dense foam along the direction of the wind. Crests of waves begin to roll over. Spray may affect visibility | |
48 - 55 |
29 ft |
Storm | Very high waves with long overhanging crests. The surface of the sea takes a white appearance. The tumbling of the sea becomes heavy and shock like. Visibility affected | |
56 - 63 |
37 ft |
Violent Storm | Exceptionally high waves. The sea is completely covered with long white patches of foam lying in the direction of the wind. Visibility affected | |
64+ |
45+ ft |
Hurricane | The air is filled with foam and spray. Sea completely white with driving spray. Visibility very seriously affected. |
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2009 by Thai Marine Meteorological Center, All Rights Reserved.
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