|
Beaufort |
Windspeed |
Windspeed |
Description |
Sea Condition |
|
Force |
Mph |
Knots |
|
|
|
0 |
0 |
0 |
Calm |
Sea like a mirror. |
|
1 |
1 - 3 |
1 - 3 |
Light Air |
Ripples but without foam crests. |
|
2 |
4 - 7 |
4 - 6 |
Light Breeze |
Small wavelets. Crests do not break. |
|
3 |
8 - 12 |
7 - 10 |
Gentle Breeze |
Large wavelets. Perhaps scattered white horses. |
|
4 |
13 - 18 |
11 - 16 |
Moderate Breeze |
Small waves. Fairly frequent white horses. |
|
5 |
19 - 24 |
17 - 21 |
Fresh Breeze |
Moderate waves, many white horses. |
|
6 |
25 - 31 |
22 - 27 |
Strong Breeze |
Large waves begin to form; white foam crests, probably spray. |
|
7 |
32 - 38 |
28 - 33 |
Near Gale |
Sea heaps up and white foam blown in streaks along the direction of the wind. |
|
8 |
39 - 46 |
34 - 40 |
Gale |
Moderately high waves, crests begin to break into spindrift. |
|
9 |
47 - 54 |
41 - 47 |
Strong Gale |
High waves. Dense foam along the direction of the wind. Crests of waves begin to roll over. Spray may affect visibility. |
|
10 |
55 - 63 |
48 - 55 |
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. |
|
11 |
64 - 73 |
56 - 63 |
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. |
|
12 |
74 - 95 |
64+ |
Hurricane |
The air is filled with foam and spray. Sea completely white with driving spray. Visibility very seriously affected. |
