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Pag. 22OM2010_GB
In the following schedule it is indicated the “Beaufort scale” that gives indications about
evaluation of the wind speed.
Number of
Beaufort
Wind speed
(km/h)
Description Ground conditions
0
0 Calm Smoke vertically climbs
1
1-6
Drivel of
wind
Wind movement visible from the
smoke.
2
7-11 Light breeze
You feels the wind on the naked skin.
The leaves rustle.
3
12-19 Tense breeze
Leaves and smaller branches in con-
stant movement.
4
20-29
Moderate
wind
Lifting of dust and paper. The bran-
ches have shaken.
5
30-39 Tense wind
The bushes oscillate with leaves.
They forms small waves in the inland
waters.
6
40-50 Fresh wind
Movement of big branches. Diffi culty
to use the umbrella.
7
51-62 Strong wind
Whole shaken trees. Diffi culty to
walk against wind.
8
63-75 Storm
Twigs torn by the trees. Generally it
is impossible to walk against wind.
9
76-87 Strong storm
Light damages to the structures (fi re-
places and tiles removed).
10
88-102 Storm
(Rare in dry land) Eradication of tre-
es. Considerable structural damages.
11
103-117 Violent storm Vast structural damages.
12
>117 Hurricane
Huge and wide damages to the struc-
tures.
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