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Beaufort Wind Scale

 

Force Description Wind Speed Sea State Wave Height (m)
Knots km/h m/sec Ave Max
0 Calm <1 0-2 0-0.2 Calm, like a mirror 0 0
1 Light Air 1-3 2-6 0.3-1.5 Ripples 0.1 0.1
2 Light Breeze 4-6 7-11 1.6-3.3 Small wavelets 0.1 0.3
3 Gentle Breeze 7-10 13-19 3.4-5.4 Occasional crests 0.6 1
4 Moderate Breeze 11-16 20-30 5.5-7.9 Small waves, frequent white horses 1 1.5
5 Fresh Breeze 17-21 31-39 8.0-10.7 Moderate waves, many white crests 2 2.5
6 Strong Breeze 22-27 41-50 10.8-13.8 Large waves, white foam crests 3 4
7 Near Gale 28-33 52-61 13.9-17.1 Sea heaps up, spray, breaking crests 4 5.5
8 Gale 34-40 63-74 17.2-20.7 Moderately high waves, breaking crests 5.5 7.5
9 Strong Gale 41-47 76-87 20.8-24.4 High waves, spray affects visibility 7 10
10 Storm 48-55 89-102 24.5-28.4 Very high waves, long breaking crests, dense foam 9 12.5
11 Violent Storm 46-63 104-117 28.5-32.6 Exceptionally high waves, foam, visibility affected 11.5 16
12 Hurricane 64+ 118+ 32.7+ Huge waves, foam and driving spray, visibility seriously affected 14 20+

 

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