| Beaufort wind scale | Knots | MPH | Wind descriptive terms | Sea descriptive terms |
|---|---|---|---|---|
| 0 | <1 | <1 | Calm | Calm (glassy) |
| 1 | 1-3 | 1-3 | Light airs | Calm (rippled) |
| 2 | 4-6 | 4-7 | Light breeze | Smooth (wavelets) |
| 3 | 7-10 | 8-12 | Gentle breeze | Slight |
| 4 | 11-16 | 13-18 | Moderate breeze | Slight - moderate |
| 5 | 17-21 | 19-24 | Fresh breeze | Moderate |
| 6 | 22-27 | 25-31 | Strong breeze | Rough |
| 7 | 28-33 | 32-38 | Near gale | Rough - Very rough |
| 8 | 34-40 | 39-46 | Gale | Very rough - High |
| 9 | 41-47 | 47-54 | Strong gale | High |
| 10 | 48-55 | 55-63 | Storm | Very high |
| 11 | 56-63 | 64-73 | Violent storm | Very high |
| 12 | 64+ | 74+ | Hurricane | Phenomenal |