Worlds of David Darling
Encyclopedia of Science
   
Home > Encyclopedia of Alternative Energy

wind speed





The rate of flow of the wind undisturbed by obstacles.


Wind speed scale
Wind Speed at 10 m height Beaufort scale Wind
0.0-0.4 m/s (0.0-0.9 knots) 0 Calm
0.4-1.8 m/s (0.9-3.5 knots) 1 Light
1.8-3.6 m/s (3.5-7.0 knots) 2 Light
3.6-5.8 m/s (7-11 knots) 3 Light
5.8-8.5 m/s (11-17 knots) 4 Moderate
8.5-11 m/s (17-22 knots) 5 Fresh
11-14 m/s (22-28 knots) 6 Strong
14-17 m/s (28-34 knots) 7 Strong
17-21 m/s (34-41 knots) 8 Gale
21-25 m/s (41-48 knots) 9 Gale
25-29 m/s (48-56 knots) 10 Strong Gale
29-34 m/s (56-65 knots) 11  
>34 m/s (>65 knots) 12 Hurricane

1 m/s = 3.6 km/h = 2.237 mph = 1.944 knots
1 knot = 1 nautical mile per hour = 0.5144 m/s = 1.852 km/h = 1.125 mph



Related category

   • WIND POWER