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| BEAUFORT WIND SCALE Beaufort No. | Velocity (knots) | Pressure lb/sq ft | Sea Description | | 0 | Less than 1 | 0 | Calm | | 1 | 1 - 3 | 0.01 | Light Air | | 2 | 4 - 6 | 0.08 | Light Breeze | | 3 | 7 - 10 | 0.28 | Gentle Breeze | | 4 | 11 - 16 | 0.67 | Moderate Breeze | | 5 | 17-21 | 1.31 | Fresh Breeze | | 6 | 20 - 27 | 2.3 | Strong Breeze | | 7 | 28 - 33 | 3.6 | Moderate Gale | | 8 | 34 - 40 | 5.4 | Fresh Gale | | 9 | 41 - 47 | 7.7 | Strong Gale | | 10 | 48 - 55 | 10.5 | Whole Gale | | 11 | 56 - 63 | 14.0 | Storm | | 12 | over 64 | 17 and above | Hurricane |
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