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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 POWERAlso on this site:
Encyclopedia of Science
Encyclopedia of History