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SEPTEMBER 2021
ENGLISH
2.2.1 Beaufort scale
A numerical scale created by Admiral Beaufort for measuring wind speed
and sea conditions offshore and after a few hours.
Force Description Knots Km/h m/sec Sea state
max.
wave
height
(m)
0 Calm <1 <1 0-0,2 Calm 0
1 Light air 1-3 1-5 0,3-1,5
2 Light breeze 4-6 6-11 1,6-3,3 Calm 0,2
3 Gentle breeze 7-10 12-19 3,4-5,4
4 Moderate breeze 11-16 20-28 5,5-7,9 Smooth 0,5
5 Fresh breeze 17-21 29-38 8,0-10,7 Slight 1,25
6 Strong breeze 22-27 39-49 10,8-13,8 2,0
7 Near gale 28-33 50-61 13,9-17,1 Moderate 2,5
8 Gale 34-40 62-74 17,2-20,7 Rough 4
9 Strong gale 41-47 75-88 20,8-24,4 Very rough 6
10 Storm 48-55 89-102 24,5-28,4 High 9
11 Violent storm 56-63 103-117 28,5-32,6 Very high 14
12 Hurricane
64
and more
118
and more
32,7
and more
Phenomenal
14
And more
NOTE
By means of this reference table you can easily understand the weather
forecasts. For example, “moderate sea” means “near gale” (7) with a wave
height of 2,5 meters. In that case boats in category “C” cannot navigate.
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