| Force |
Speed in knots |
Description |
| 0 |
< 1 |
Calm |
| 1 |
1 - 3 |
Light
air |
| 2 |
4 - 6 |
Light breeze |
| 3 |
7 - 10 |
Gentile breeze |
| 4 |
11 - 16 |
Moderate breeze |
| 5 |
17 - 21 |
Fresh breeze |
| 6 |
22 - 27 |
Strong breeze |
| 7 |
28 - 33 |
Near gale |
| 8 |
34 - 40 |
Gale |
| 9 |
41 - 47 |
Strong gale |
| 10 |
48 - 55 |
Storm |
| 11 |
56 - 63 |
Violent stom |
| 12 |
>= 64 |
Hurricane |
History of the Beaufort Scale
