Jul 25 2007

Conversion Tables

Published by admin

Bft MPH Knots Name Sea Description

3

 8-12 6.21-10.53 Gentle Large wavelets; crests begin to break, Breeze scattered whitecaps

4

 13-18 10.53-15.39 Moderate Small waves 0.5 - 1.25 meters high, Breeze becoming longer; numerous whitecaps

5

 19-24 15.39-20.79 Fresh Moderate waves of 1.25 - 2.5 m. Breeze taking longer form; many whitecaps; some spray

6

 25-31 20.79-26.73 Strong Larger waves 2.5 - 4 meters forming; Breeze whitecaps everywhere, more spray

7

 32-38 26.73-33.21 Near gale Sea heaps up, waves 4 - 6 m; Gale white foam from breaking waves begins to be blown in streaks

8

 39-46 33.21-40.23 Gale Moderately high (4 - 6 m) waves of greater length; edges of crests begin to break into spindrift; foam is blown in well-marked streaks

9

 47-54 40.23-47.79 Strong gale High waves (6 m); sea begins Gale to roll; dense streaks of foam; spray may reduce visibility
10 55-63 47.79-55.35 Storm Very high waves (6 - 9 m) with overhanging crests; sea takes a white appearance as foam is blown in very dense streaks; rolling is heavy and visibility is reduced
11 64-72 55.35-63.44 Violent storm Exceptionally high (9-14 m) waves; Storm sea covered with white foam patches; visibility still more reduced

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