Beaufort Scale of Wind Force and Its Probable Wave Height
Beaufort Scale of Wind Force and Its Probable Wave Height

Beaufort
number
Description term Wind speeds Wave height (m)
Wind Wave knots m/s probable maximum
0 Calm - < 1 0 - 0.2 - -
1 Light air Ripples 1 - 3 0.3 - 1.5 0.1 0.1
2 Light breeze Small wavelets 4 - 6 1.6 - 3.3 0.2 0.3
3 Gentle breeze Large wavelets 7 - 10 3.4 - 5.4 0.6 1.0
4 Moderate breeze Small waves 11 - 16 5.5 - 7.9 1.0 1.5
5 Fresh breeze Moderate waves 17 - 21 8.0 - 10.7 2.0 2.5
6 Strong breeze Large waves 22 - 27 10.8 - 13.8 3.0 4.0
7 Near gale Large waves 28 - 33 13.9 - 17.1 4.0 5.5
8 Gale Moderately high waves 34 - 40 17.2 - 20.7 6.0 7.5
9 Strong gale High waves 41 - 47 20.8 - 24.4 7.0 10.0
10 Storm Very high waves 48 - 55 24.5 - 28.4 9.0 12.5
11 Violent storm Exceptionally high waves 56 - 63 28.5 - 32.6 11.5 16.0
12 Hurricane Exceptionally high waves 64 - 71 32.7 - 36.9 14.0 > 16
13 Hurricane Exceptionally high waves 72 - 80 37.0 - 41.4 > 14 > 16
14 Hurricane Exceptionally high waves 81 - 89 41.5 - 46.1 > 14 > 16
15 Hurricane Exceptionally high waves 90 - 99 46.2 - 50.9 > 14 > 16
16 Hurricane Exceptionally high waves 100 - 109 51.0 - 56.0 > 14 > 16
17 Hurricane Exceptionally high waves 109 - 118 56.1 - 61.2 > 14 > 16

Graph

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