Windspeed Conversion Table


 Knots  Bft.  M/S  KM/h  Mph  Label  Effect on Sea
 <1  0  0-0.2  <1  <1  Calm  Sea like a mirror
 1-3  1  0.3-1.5  1-5  1-3  Light air  Ripples with the appearance of scales are formed, but without foam crests
 4-6  2  1.6-3.3  6-11  4-7  Light breeze  Small wavelets, still short, but more pronounced. Crests have a glassy appearance and do not break
 7-10  3  3.4-5.4  12-19  8-12  Gentle breeze  Large wavelets. Crests begin to break. Foam of glassy appearance. Perhaps scattered white horses
 11-15  4  5.5-7.9  20-28  13-17  Moderate breeze  Small waves, becoming larger; fairly frequent white horses
 16-21  5  8.0-10.7  29-38  18-24  Fresh breeze  Moderate waves, taking a more pronounced long form; many white horses are formed. Chance of some spray
 22-27  6  10.8-13.8  39-49  25-31  Strong breeze  Large waves begin to form; the white foam crests are more extensive everywhere. Probably some spray
 28-33  7  13.9-17.1  50-61  32-38  Near Gale  Sea heaps up and white foam from breaking waves begins to be blown in streaks along the direction of the wind
 34-40  8  17.2-20.7  62-74  39-46  Gale  Moderately high waves of greater length; edges of crests begin to break into spindrift. The foam is blown in well-marked streaks along the direction of the wind
 41-47  9  20.8-24.4  75-88  47-54  Severe Gale  High waves. Dense streaks of foam along the direction of the wind. Crests of waves begin to topple, tumble and roll over. Spray may affect visibility
 48-55  10  24.5-28.4  89-102  55-63  Storm  Very high waves with long over-hanging crests. The 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. The 'tumbling' of the sea becomes heavy and shock-like. Visibility affected
 56-63  11  28.5-32.6  103-117  64-72  Violent Storm  Exceptionally high waves (small and medium-size ships might be for a time lost to view behind the waves). The sea is completely covered with long white patches of foam lying along the direction of the wind. Everywhere the edges of the wave crests are blown into froth. Visibility affected
 64-71  12  32.7-36.9  118-133  73-82  Hurricane  The air is filled with foam and spray. Sea completely white with driving spray; visibility very seriously affected


 
Current Wind Speed
 
 
Current Gust Speed