IT
To visually recognise this wind speed, refer to the empirical wind evaluation scale below:
Speed
Force
Type of wind
(knots)
0
Calm
0 - 1
1
Light air
1 - 3
2
Light breeze
4 - 6
3
Gentle breeze
7 - 10
4
Moderate breeze
11 - 16
5
17 - 21
Fresh breeze
6
Strong breeze
22 - 27
7
28 - 33
Near gale
8
Gale
34 - 40
9
41 - 47
Strong gale
10
Storm
48 - 55
11
Violent storm
56 - 63
12
Hurricane
64 +
It is strictly forbidden to use the platform when the wind speed exceeds 45 km/h.
BEAUFORT scale (wind speed at a height of 10 m on a flat site)
Speed
Speed
(km/h)
(m/s)
0 - 1
< 0,3
Smoke rises vertically.
1 - 5
0,3 - 1,5
Smoke indicates direction of wind.
6 - 11
1,6 - 3,3
Wind felt on face, leaves rustle.
Leaves and small twigs in constant
12 - 19
3,4 - 5,4
motion.
Wind raises dust and loose pieces of
20 - 28
5,5 - 7,9
paper; small branches are moved.
29 - 38
8 - 10,7
Small tees in leaf begin to sway.
Large branches in motion, whistling heard
39 - 49
10,8 - 13,8
in overhead wires, umbrella use becomes
difficult.
Whole trees in motion, inconvenience felt
50 - 61
13,9 - 17,1
when walking against the wind.
Wind breaks twigs off trees; impedes
62 - 74
17,2 - 20,7
progress.
Wind damages roofs (chimneys, slates,
75 - 88
20,8 - 24,4
etc.).
Seldom experienced inland; trees upro-
89 - 102
24,5 - 28,4
oted; considerable structural damage
occurs.
103 - 117
28,5 - 32,6
Very rare, widespread damage.
118 +
32,7 +
Devastating damage.
US
Effects on Land
1-7
www.duma-rent.com
FR
Sea conditions
Sea is like a mirror.
Ripples with appearance of scale,
no foam crests.
Short wavelets, but pronounced.
Very small waves, crests begin to
break.
Small waves, becoming longer,
numerous whitecaps.
Wavelets form on inland waters;
moderate waves, taking longer
form.
Larger waves forming, whitecaps
everywhere, some spray.
Sea heaps up; white foam from
breaking waves begins to be blown
in streaks along the direction of
the wind.
Moderately high waves of greater
length; edges of crests begin to
break into spindrift.
High waves, crests of waves begin
to topple, streaks of foam; reduced
visibility.
Very high waves; white streaks of
foam; reduced visibility.
Exceptionally high waves able to
hide medium sized ships from view,
reduced visibility.
Sea completely white; air filled
with foam and spray, very reduced
visibility.