• Force 0   
    • 0-1 mph      0-1 knots     0-1 kmph
    • Calm  - Probable waves 0.0m - glassy seas .
    • Smoke rises vertically on land.
  • Force 1   
    •  1-4 mph       1-3  knots      2-6 kmph
    • Light breeze - Probable waves 0.0 - 0.1m- glassy ripples.
    • On land direction of wind shown by smoke but not by wind vanes.
  • Force 2     
    • 4 -7 mph       4-7 knots     7-11 kmph  
    • Light breeze - Probable waves 0.2 - 0.3m ~ smooth wavelets .
    • On land wind felt on face; leaves rustle;
  • Force 3     
    • 8-12 mph       7-10 knots   12-19 kmph
    • Gentle breeze - Probable waves 0.6 -1.0m.
    • On land leaves and small twigs in constant motion;
  • Force 4   
    • 13-18 mph   11-16 knots  20-30kmph
    • Moderate breeze - Probable waves 1.0 - 1.5m
    • On land dust rises and loose paper/branches move.
  • Force 5     
    • 19-24 mph     17-21 knots  31-39 kmph
    • Fresh breeze. Probable waves  2- 2.5m.
    • On land small trees in leaf begin to sway;
  • Force 6 
    • 25-31 mph  22-27 knots     40-50 kmph
    • Strong breeze, Probable waves 3-4m, possible sea spray
    • On land large branches move; umbrellas unsafe,
  • Force 7  
    • 32-38 mph    28-33 knots       51-61 kmph
    • Moderate / near gale, Probable waves 4.0 - 5.5m
    • Whole trees in motion, impedes walking 
  • Force 8   
    • 39 -46 mph     34-40 knots      62-70 kmph
    • Fresh Gale, Probable waves 5.5 - 7.0m 
    • Twigs break off trees, difficulty in walking