Beaufort Wind Scale
A scale created by Rear-Admiral, Sir Francis Beaufort in 1805
Beaufort No. |
Wind |
Description
|
Effect
|
0 |
0-1 |
Calm | Smoke rises vertically |
1 |
1-3 |
Light air | Smoke drifts but wind vanes do not move |
2 |
4-7 |
Light breeze | Wind felt on face, leaves rustle, weather vanes move |
3 |
8-12 |
Gentle breeze | Leaves, small twigs and light flags move |
4 |
13-18 |
Moderate breeze | Dust and loose paper lifted, small branches moved |
5 |
19-24 |
Fresh breeze | Wavelets form on inland water, small trees sway |
6 |
25-31 |
Strong breeze | Large branches move, telegraph wires whistle |
7 |
32-38 |
Near gale | Whole trees move, difficult to walk against wind |
8 |
39-46 |
Gale | Breaks twigs off trees, difficulty walking |
9 |
47-54 |
Severe gale | Slight damage to buildings, e.g. chimney pots |
10 |
55-63 |
Storm | Trees uprooted, structural damage |
11 |
64-72 |
Violent storm | Rarely experienced, widespread damage |
12 |
73-83 |
Hurricane | - - - |
