Inhoudsopgave
Advertenties
IT
To visually recognise this wind speed, refer to the empirical wind evaluation scale below:
Speed
Force
Type of wind
(knots)
0
Calm
1
Light air
2
Light breeze
3
Gentle breeze
Moderate
4
11 - 16
breeze
5
17 - 21
Fresh breeze
6
Strong breeze
22 - 27
7
28 - 33
Near gale
8
34 - 40
Gale
9
41 - 47
Strong gale
10
48 - 55
Storm
11
Violent storm
56 - 63
12
Hurricane
Ensure that the wind speed is not higher than 36 km/h - 10 m/s (22.3 mph - 32.8 ft/s).
BEAUFORT scale (wind speed at a height of 10 m on a flat site)
Speed
Speed
(km/h)
(m/s)
0 - 1
0 - 1
< 0,3
1 - 3
1 - 5
0,3 - 1,5
4 - 6
6 - 11
1,6 - 3,3
7 - 10
12 - 19
3,4 - 5,4
20 - 28
5,5 - 7,9
29 - 38
8 - 10,7
39 - 49
10,8 - 13,8
50 - 61
13,9 - 17,1
62 - 74
17,2 - 20,7
75 - 88
20,8 - 24,4
89 - 102
24,5 - 28,4
103 - 117 28,5 - 32,6 Very rare, widespread damage.
64 +
118 +
32,7 +
US
Effects on Land
Smoke rises vertically.
Smoke indicates direction of wind.
Wind felt on face, leaves rustle.
Leaves and small twigs in constant motion.
Wind raises dust and loose pieces of paper;
small branches are moved.
Small tees in leaf begin to sway.
Large branches in motion, whistling heard
in overhead wires, umbrella use becomes
difficult.
Whole trees in motion, inconvenience felt
when walking against the wind.
Wind breaks twigs off trees; impedes
progress.
Wind damages roofs (chimneys, slates,
etc.).
Seldom experienced inland; trees upro-
oted; considerable structural damage
occurs.
Devastating damage.
1-8
NL
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.
Advertenties
Inhoudsopgave
