| Beaufort wind force | mean speed in Knots | Limits of wind speed in knots | Descriptive term | Probable height of waves in meters | Probable maximum height of waves in meters |
| Measured at a height of 10 m. above sea level | |||||
| 0 | 00 | Less than 1 | Calm | 0 | 0 |
| 1 | 02 | 1-3 | Light air | 0 | 0.1 |
| 2 | 05 | 4-6 | Light breeze | 0.1 | 0.3 |
| 3 | 09 | 7-10 | Gentle breeze | 0.4 | 1.0 |
| 4 | 13 | 11-16 | Moderate breeze | 1.0 | 1.5 |
| 5 | 19 | 17-21 | Fresh breeze | 2.0 | 2.5 |
| 6 | 24 | 22-27 | Strong breeze | 3.0 | 4.0 |
| 7 | 30 | 28-33 | Near gale | 4.0 | 5.5 |
| 8 | 37 | 34-40 | Gale | 5.5 | 7.5 |
| 9 | 44 | 41-47 | Strong gale | 7.0 | 10.0 |
| 10 | 52 | 48-55 | Storm | 9.0 | 12.5 |
| 11 | 60 | 56-63 | Violent storm | 11.5 | 16..05 |
| 12 | ** | 64 and over | Hurricane force | 14 or over | ** |
