Page 205 - RRS 2017 - 2020 (Reprint)

BEAUFORT SCALE

Wind
Bft Kn Km/hr m/sec ft/sec
1 1 1.85 0.51 1.69 Light air, ripples
2 3.71 103 3.38
3 5.56 1.54 5.07
2 4 7.41 2.06 6.76 Light breeze, small wavelets
5 9.27 2.57 8.44
6 11.12 3.09 10.13
3 7 12.97 3.60 11.82 Gentle breeze, large wavelets
8 14.82 4.12 13.51
9 16.68 4.63 15.20
10 18.53 5.15 16.89
4 11 20.38 5.66 18.58 Moderate breeze, small waves,
12 22.24 6.18 20.27 frequent white horses
13 24.09 6.69 21.96
14 25.94 7.21 23.64
15 27.80 7.72 25.33
16 29.65 8.24 27.02
5 17 31.50 8.75 28.71 Fresh breeze, moderate waves,
18 33.36 9.27 30.40 white horses.
19 35.21 9.78 32.09
20 37.06 10.29 33.78
21 38.91 10.81 35.47
6 22 40.77 11.32 37.16 Strong breeze, foaming crests
23 42.62 11.84 38.84
24 44.47 12.35 40.53
25 46.33 12.87 42.22

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