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Author Topic: BEAUFORT SCALE: Specifications and equivalent speeds for use at sea  (Read 2850 times)
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« on: July 28, 2008, 10:22:56 CET »

For anyone who might be interested I found this wind scale. Conversion from knots to wind force.

     10 m above ground
     miles/hour  knots
0       0-1      0-1      Calm             Sea like a mirror
1       1-3      1-3      Light air        Ripples with the appearance of
                                                  scales are formed, but without
                                                  foam crests.
2       4-7      4-6      Light Breeze     Small wavelets, still short,
                                                      but more pronounced. Crests
                                                      have a glassy appearance and
                                                      do not break.
3       8-12     7-10   Gentle Breeze    Large wavelets. Crests begin
                                                        to break. Foam of glassy
                                                        appearance. Perhaps scattered
                                                        white horses.
4      13-18    11-16  Moderate Breeze  Small waves, becoming larger;
                                                         fairly frequent white horses.
5      19-24    17-21  Fresh Breeze     Moderate waves, taking a more
                                                      pronounced long form; many
                                                      white horses are formed.
                                                      Chance of some spray.
6      25-31    22-27     Strong Breeze    Large waves begin to form; the
                                                          white foam crests are more
                                                          extensive everywhere.
                                                          Probably some spray.
7      32-38    28-33     Near Gale        Sea heaps up and white foam
                                                       from breaking waves begins to
                                                        be blown in streaks along the
                                                       direction of the wind.
8      39-46    34-40     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.
9      47-54    41-47     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.
10     55-63    48-55     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
11    64-72     56-63     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.
12    73-83     64-71     Hurricane        The air is filled with foam and
                                                        spray. Sea completely white with
                                                        driving spray; visibility very
                                                        seriously affected.

If you ain't living on the edge, your taking too much bloody space

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« Reply #1 on: July 28, 2008, 16:53:02 CET »    Tongue

Chris  Cool
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« Reply #2 on: July 29, 2008, 08:11:44 CET »

Kemm kont noob f'din il-bicca tax-xoghol :-) ....... u jiena dejjem nghid imma knots kemm jigu forza u inqalleb gol-google u hekk ......... umbaghad tigi inti u tiluminani dwar x'kelli naghmel. hahahahaha ... tajba din

If you ain't living on the edge, your taking too much bloody space

Visit my Photo Sets @

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