- 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
