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Force 0:
Wind speed less than 1 knot,
Sea: Like a mirror
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Force 1: Wind speed 1-3 knots,
Sea: Wave height 0.1 m; Ripples with appearance of scales
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Force 2: Wind speeds 4-6 knots,
Sea: Wave ht. 0.2-0.3 m;
Small wavelets, crests of glassy appearance, not breaking
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Force 3: Wind speeds 7-10 knots,
Sea: Wave ht. 0.6-1.0 m;
Large wavelets, crests begin to break, scattered white
caps.
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Force 4: Wind speeds 11-17 knots,
Sea: Wave ht. 1.0-1.5 m;
Small waves becoming longer, numerous white caps.
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Force 5: Wind speeds 17-21 knots,
Sea: Wave ht. 2.0-2.5 m;
Moderate waves, taking longer form, many white caps,
some spray.
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Force 6: Wind speeds 22-27 knots,
Sea: Wave ht. 3-4 m;
Larger waves forming, white caps everywhere, more spray.
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Force 7: Wind speeds 28-33 knots,
Sea: Wave ht. 4.0-5.5 m;
Sea heaps up, white foam from breaking waves begins to
be blown in streaks in direction of wind.
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Force 8: Wind speeds 33-40 knots,
Sea: Wave ht. 5.5-7.5 m;
Moderately high waves of greater length, edges of crests
begin to break into spindrift, foam is blown in well marked streaks.
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Force 9: Wind speeds 41-47 knots,
Sea: Wave ht. 7-10 m;
High waves, sea begins to roll, dense streaks of foam
along wind direction, spray may reduce visibility.
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Force 10: Wind speeds 48-55 knots,
Sea: Wave ht. 9-12.5 m;
Very high waves with overhanging crests, sea takes white
appearance as foam is blown invery dense streaks, rolling is heavy and
shocklike, visibility is reduced.
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Force 11: Wind speeds 56-63 knots,
Sea: Wave ht. 11.5-16 m;
Exceptionally high waves sea covered with white foam
patches, visibility still more reduced.
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