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| BEAUFORT
FORCE |
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| Force | Description | Sea State | Specification on land |
knots* |
km/h* |
mph*
|
|
0 |
Calm | Sea like mirror | Smoke rises vertically |
<1 |
<1 |
<1 |
|
1 |
Very Light | Ripples with appearance of scales, no form crests | Direction of wind shown by smoke drift but not by wind vanes |
1
- 3 |
1
- 5 |
1
- 3 |
|
2 |
Light breeze | Wavelets, small but pronounced. Crests with glassy appearance, but do not break. | Wind felt on face, leaves rustle, ordinary wind vane moved by wind. |
4
- 6 |
6
- 11 |
4
- 7 |
|
3 |
Gentle breeze | Large wavelets, crests begin to break. Glassy looking foam, occasional white horses. | Leaves and small twigs in constant motion, wind extends light flag. | 7
- 10 |
12
- 19 |
8
- 12 |
|
4 |
Moderate breeze | Small waves becoming longer, frequent white horses. | Wind raises dust and loose paper, small branches move. | 11
- 16 |
20
- 29 |
13
- 18 |
|
5 |
Fresh breeze | Moderate waves of pronounced long form. Many whit horses, some spray. | Small trees in leaf start to sway, crested wavelets form on inland waters. | 17
- 21 |
30
- 39 |
19
- 24 |
|
6 |
Strong breeze | Some large waves, extensive white foam crests, some spray. | Large branches in motion, whistling in telegraph wires, umbrellas used with difficulty. | 22
- 27 |
40
- 50 |
25 - 31 |
|
7 |
Near gale | Sea heaped up, white foam from breaking waves blowing in streaks with the wind. | Whole trees in motion, inconvenience felt when walking against wind. |
28 - 33
|
51
- 61 |
32 - 38 |
|
8 |
Gale | Moderately high and long waves. Crests break into spindrift, blowing foam in well marked streaks. | Twigs break from trees, difficult to walk. |
34 - 40
|
62
- 74 |
39 - 46
|
|
9 |
Strong gale | High waves, dense foam streaks in wind, wave crests topple, tumble and roll over. Spray reduces visibility | Slight structural damage occurs, chimney pots and slates removed |
41 - 47
|
75 - 87 |
47
- 54 |
|
10 |
Storm | Very high waves with long overhanging crests. Dense blowing foam, sea surface appears white. Heavy tumbling of sea, shock-like, poor visibility. | Trees uprooted, considerable structural damage occurs. |
48 - 55
|
88
- 101 |
55
- 63 |
|
11 |
Violent storm | Exceptionally high waves, sometimes concealing small and medium sized ships. Sea completely covered with long white patches of foam. Edges of wave crests blown into froth. Poor visibility. | Widespread damage. | 56
- 63 |
102
- 117 |
64
- 73 |
|
12 |
Hurricane | Air filled with foam and spray, sea white with driving spray, poor visibility. | Widespread damage. |
>64 |
>119
|
>74
|
* Equivalent Speed (10m above ground) To find weather conditions in your area go to www.metoffice.com |
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| www.flagpolecompany.co.uk |
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Modified
March 3, 2006
