Havering Sailing Club
Dinghy Sailing for all.
Wind speeds for sailors
Wind speeds for sailors
Force Description Specification on land Specification for use at Sea. Knots MPH. Forecast Description Sea State
1 Light air Direction of wind shown by smoke drift but not by wind vanes. Ripples with the appearance of scales formed but without foam crests. 1 - 3 1 - 3 Light Calm
2 Light Breeze Wind felt on face, leaves rustle, vanes moved by wind. Small wavelets, still short but more pronounced.  Crests have a glassy appearance and do not break. 4 -6 4 - 7 Light Smooth
3 Gentle Breeze Leaves and small twigs in constant motion; wind extends light flag. Large wavelets.  Crests begin to break  Foam of glassy appearance.  Perhaps scattered white horses. 7 - 10 8 - 12 Light Smooth
4 Moderate Breeze Raises dust and loose paper; small branches are moved. Small waves, becoming longer; fairly frequent white horses. 11 - 16 13 - 18 Moderate Slight
5 Fresh Breeze Small trees begin to sway; crested wavelets form. Moderate waves, taking a more pronounced long form; many white horses formed. 17 - 21 19 - 24 Fresh Moderate
6 Strong Breeze Large branches in motion; whistling heard in telegraph wires; umbrellas used with difficulty. Large waves begin to form; the white foam crests are more extensive everywhere.  Probably some spray. 22 - 27 25 - 31 Strong Rough

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Wind speeds for sailors