Wind scale

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Beaufort Wind Scale

The Beaufort wind scale was developed by Sir Francis Beaufort in 1806 as a means to describe wind speeds and accompanying seas states. While Beaufort was an admiral in the British Navy he determined that no two sailors could describe the wind and sea conditions in the same manner. The standardized system has been added to since its inception but for the most part Beaufort Wind Force Scale 0-12 has remained unchanged.

Beaufort Wind Scale

Beaufort Number Description Wind Speed Wave Height (Avg/Max) Observations
0 Calm < 1 knot 0 m Flat calm.
1 Light Air 1-3 knots 0.1 m Calm, ripples.
2 Light Breeze 4-6 knots 0.2 m / 0.3 m Smooth, wavelets.
3 Gentle Breeze 7-10 knots 0.6 m / 1.0 m Slight.
4 Moderate Breeze 11-16 knots 1.0 m / 1.5 m Slight-Moderate.
5 Fresh Breeze 17-21 knots 2.0 m / 2.5 m Moderate.
6 Strong Breeze 22-27 knots 3.0 m / 4.0 m Rough.
7 Near Gale 28-33 knots 4.0 m / 5.5 m Rough-Very Rough.
8 Gale 34-40 knots 5.5 m / 7.5 m Very rough-High.
9 Severe Gale 41-47 knots 7.0 m / 10.0 m High
10 Storm 48-55 knots 9.0 m / 12.5 m Very High.
11 Violent Storm 56-63 knots 11.5 m / 16.0 m Very High.
12 Hurricane > 64 knots 14 m + Phenomenal

References

  • UK MetOffice [1]
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