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BEAUFORT Wind Scale and Corresponding State of the Sea, After Few Hours of Wind, Away From the Coast.
Boat Design Categories (Directive 2013/53/EU):
NOTE: The significant wave height is the mean height of the highest one-third of the waves, which approximately
corresponds to the wave height estimated by an experienced observed. Some waves will be double this height.
Design category
"A" - "Ocean"
"B"- "Offshore"
"C"- "Inshore"
"D"- "Sheltered waters"
Wind force
(Beaufort scale)
exceeding 8
up to,and including, 8
up to,and including, 6
up to,and including, 4
Significant wave height
exceeding 4
up to,and including, 4
up to,and including, 2
up to,and including, 0.3
State of the sea
Force Denomination Knots Km /h m/sec and wave height in meters
0 Calm <1 <1 0-0.2 Calm 0
1 Light Air 1-3 1-5 0.3-1.5 Calm 0
2 Light Breeze 4-6 6-11 1.6-3.3 Almost calm 0.2
3 Gentle Breez 7-10 12-19 3.4-5.4 Almost calm 0.2
4 Moderate Breeze 11-16 20-28 5.5-7.9 Small waves 0.5
5 Strong Breeze 17-21 29-38 8.0-10.7 Large waves 1.25
6 Fresh Wind 22-27 39-49 10.8-13.8 Large waves 2.0
7 Strong Wind 28-33 50-61 13.9-17.1 Very large waves 2.5
8 Gale 34-40 62-74 17.2-20.7 Rough sea 4
9 Strong Gale 41-47 75-88 20.8-24.4 Very rough sea 6
10 Storm 48-55 89-102 24.5-28.4 Heavy 9
11 Violent Storm 56-63 103-117 28.5-32.6 Very heavy 14
12 Hurricane 64 and over 118 and over 32.7and over Stormy 14 and over
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