|
Beaufort Scale
|
Speed MPH
|
Description |
|
0
|
below 1
|
Calm: smoke rises vertically |
|
1
|
1-3
|
Light Air: Smoke drifts; leaves barely move |
|
2
|
4-7
|
Light Breeze: Leaves rustle; wind can be felt |
|
3
|
8-12
|
Gentle Breeze: Leaves and twigs move; debris and dust raised from ground |
|
4
|
13 -18
|
Moderate Breeze: Small branches move; debris and dust raised from ground |
|
5
|
19 - 24
|
Fresh Breeze: Small trees sway and large branches in motion; dust clouds raised |
|
6
|
25 - 31
|
Strong Breeze: Large branches continuously move; wind whistles; difficulty using and umbrella |
|
7
|
32 - 38
|
Moderate Gale: Large trees sway; difficulty walking |
|
8
|
39 - 46
|
Fresh Gale: Twigs and small branches break; walking very difficult |
|
9
|
47 - 54
|
Strong Gale: Slight damage to buildings; shingles blow off roof |
|
10
|
55 - 63
|
Whole Gale: Large trees uprooted; heavy damage to buildings |
|
11
|
64 - 72
|
Storm: Widespread damage |
|
12
|
above 73
|
Hurricane: Severe damage and destruction |