Beaufort scale.

The Beaufort scale of wind force is a very useful means of converting wind speed in to a sea state.

The whole scale can be tricky to remember, however there are several points that are easy to identify.

  • Force 3

At force 3, white water will first appear.

  • Force 5

At force 5, spray begins to splash on the deck.

  • Force 7

At force 7, the surface of the sea develops distinctive white streaks.

With these reference points, it becomes fairly easy to assess wind forces between these points.

A useful quick calculator of Beaufort scale is to divide the wind speed in knots by 5 then add 1 to find the force.

20kn ÷ 5 = 4 + 1 = Force 5.

30kn ÷ 5 = 6 + 1 = Force 7. is free to use, but if you feel you would like to contribute to the running and development costs you can donate via Paypal:

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