Beaufort scale of wind (nautical)
- Beaufort scale of wind (nautical)
-
Beaufort number name of wind wind speed description of sea surface
knots kph
0 calm <1 <1 sea like a mirror
1 light air 1–3 1–5 ripples with appearance of scales are formed, without foam crests
2 light breeze 4–6 6–11 small wavelets still short but more pronounced; crests have a glassy appearance but do not break
3 gentle breeze 7–10 12–19 large wavelets; crests begin to break; foam of glassy appearance; perhaps scattered white horses
4 moderate breeze 11–16 20–28 small waves becoming longer; fairly frequent white horses
5 fresh breeze 17–21 29–38 moderate waves taking a more pronounced long form; many white horses are formed; chance of some spray
6 strong breeze 22–27 39–49 large waves begin to form; the white foam crests are more extensive everywhere; probably some spray
7 moderate gale (or near gale) 28–33 50–61 sea heaps up and white foam from breaking waves begins to be blown in streaks along the direction of the wind; spindrift begins to be seen
8 fresh gale (or gale) 34–40 62–74 moderately high waves of greater length; edges of crests break into spindrift; foam is blown in well-marked streaks along the direction of the wind
9 strong gale 41–47 75–88 high waves; dense streaks of foam along the direction of the wind; sea begins to roll; spray affects visibility
10 whole gale (or storm) 48–55 89–102 very high waves with long overhanging crests; resulting foam in great patches is blown in dense white streaks along the direction of the wind; on the whole the surface of the sea takes on a white appearance; rolling of the sea becomes heavy; visibility affected
11 storm (or violent storm) 56–63 103–114 exceptionally high waves; small- and medium-sized ships might be for a long time lost to view behind the waves; sea is covered with long white patches of foam; everywhere the edges of the wave crests are blown into foam; visibility affected
12–17 hurricane 64 and above 117 and above the air is filled with foam and spray; sea is completely white with driving spray; visibility very seriously affected
Beaufort number sea disturbance number average wave
height
ft m
0 0 0 0
1 0 0 0
2 1 0–1 0–0.3
3 2 1–2 0.3–0.6
4 3 2–4 0.6–1.2
5 4 4–8 1.2–2.4
6 5 8–13 2.4–4
7 6 13–20 4–6
8 6 13–20 4–6
9 6 13–20 4–6
10 7 20–30 6–9
11 8 30–45 9–14
12–17 9 over 45 over 14
See as table:
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Universalium.
2010.
Look at other dictionaries:
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