Κλίμακα Beaufort
| BEAUFORT SCALE | ||||||
|---|---|---|---|---|---|---|
| Observable Effects | International Description | Beaufort Number | Wind Speed | |||
| meters/sec m/s | km/hour km/h | miles/hour mph | knots kt | |||
| Air calm; smoke rises vertically | Calm | 0 | < 0.5 | < 1 | < 1 | < 1 |
| Direction of wind shown by smoke drift but not by wind vanes | Light Air | 1 | 0.5-1.5 | 1-5 | 1-3 | 1-3 |
| Wind felt on face; leaves rustle; wind vanes moved by wind | Light Breeze | 2 | 2-3 | 6-11 | 4-7 | 4-6 |
| Leaves and small twigs in continual motion; wind extends light flags | Gentle Breeze | 3 | 4-5 | 12-19 | 8-12 | 7-10 |
| Raises dust, loose paper; moves small branches | Moderate Breeze | 4 | 6-8 | 20-29 | 13-18 | 11-15 |
| Small trees in leaf begin to sway; white crested wavelets form on inland waters | Fresh Breeze | 5 | 9-10 | 30-39 | 19-24 | 16-21 |
| Large branches in motion; umbrellas used with difficulty; telephone wires "whistle" | Strong Breeze | 6 | 11-13 | 40-50 | 25-31 | 22-27 |
| Whole trees in motion; inconvenience felt walking against wind | Moderate or Near Gale | 7 | 14-17 | 51-61 | 32-38 | 28-33 |
| Breaks twigs off trees; wind generally impedes progress | Gale or Fresh Gale | 8 | 18-20 | 62-74 | 39-46 | 34-40 |
| Slight structural damage occurs | Strong Gale | 9 | 21-24 | 75-87 | 47-54 | 41-47 |
| trees uprooted; considerable structural damage occurs | Whole Gale or Storm | 10 | 25-28 | 88-101 | 55-63 | 48-55 |
| Widespread damage | Violent Storm | 11 | 29-33 | 102-118 | 64-73 | 56-63 |
| Devastation | Hurricane | 12 | > 33 | > 118 | > 73 | > 64 |
| [ 1 mile = 1609 m ] [ 1 nautical mile = 1852 m ] [ 1 knot = 1 nautical mile per hour ] | ||||||