Beaufort Wind Scale & Sea State
A complete maritime reference for wind force and sea state conditions.
| Force | Knots | m/s | Description | Wave Height |
|---|---|---|---|---|
| 0 | < 1 | < 0.5 | Calm. Sea like a mirror. | 0 m |
| 1 | 1-3 | 0.5-1.5 | Light air. Ripples like scales. | 0.1 m |
| 2 | 4-6 | 1.6-3.3 | Light breeze. Small wavelets. | 0.2 m |
| 3 | 7-10 | 3.4-5.4 | Gentle breeze. Large wavelets, scattered whitecaps. | 0.6 m |
| 4 | 11-16 | 5.5-7.9 | Moderate breeze. Small waves, frequent whitecaps. | 1.0 m |
| 5 | 17-21 | 8.0-10.7 | Fresh breeze. Moderate waves, many whitecaps. | 2.0 m |
| 6 | 22-27 | 10.8-13.8 | Strong breeze. Large waves, white foam crests. | 3.0 m |
| 7 | 28-33 | 13.9-17.1 | Near gale. Sea heaps up, foam blown in streaks. | 4.0 m |
| 8 | 34-40 | 17.2-20.7 | Gale. Moderately high waves of greater length. | 5.5 m |
| 9 | 41-47 | 20.8-24.4 | Strong gale. High waves, dense foam, crests roll. | 7.0 m |
| 10 | 48-55 | 24.5-28.4 | Storm. Very high waves, sea looks white. | 9.0 m |
| 11 | 56-63 | 28.5-32.6 | Violent storm. Exceptionally high waves. | 11.5 m |
| 12 | 64+ | 32.7+ | Hurricane. Air filled with foam and spray. | 14.0 m+ |
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