| Degree
|
(km/h)
|
Type
of wind |
(knots) |
Definition |
(m/s)
|
| 0
|
0
- 1 |
calm
|
0
- 1 |
The
smoke rises vertically; the sea is like a mirror.
|
<
0.3 |
| 1
|
1
- 5 |
puff
of wind |
1
- 3 |
The
wind turns aside the smoke; ripples of the water.
|
0.3
- 1.5 |
| 2
|
6
- 11 |
light
breeze |
4
- 6 |
The
leaves move; small but obvious waves.
|
1.6
- 3.3 |
| 3
|
12
- 19 |
breeze
|
7
- 10 |
Constantly
churned leaves and twigs; small waves,crests that begin to
break.
|
3.4
- 5.4 |
| 4
|
20
- 28 |
lively
breeze |
11
- 16 |
The
wind raises powder, leaves sand banks, the coppers is churned;
small waves that become longer.
|
5.5
- 7.9 |
| 5
|
29
- 38 |
stiff
breeze |
17
- 21 |
The
shrubs with leaves oscillate; small are formed waves in inner
waters; lengthened moderate waves.
|
8
- 10.7 |
| 6
|
39
- 49 |
fresh
wind |
22
- 27 |
Great
churned, hissing sound between coppers the telegraphic wires;
billow with white foam crests are formed, and sprays.
|
10.8
- 13.8 |
| 7
|
50
- 61 |
moderate
gale |
28
- 33 |
Entire
churned trees, difficulty to walk against wind; the sea is
large, the foam begins to being frayed in wakes.
|
13.9
- 17.1 |
| 8
|
62
- 74 |
moderate
squall |
34
- 40 |
Broken
coppers, to walk against wind are impossible; lengthened billow
of medium height and more, from the crests they detach whirlwinds
of sprays.
|
17.2
- 20.7 |
| 9
|
75
- 88 |
strong
squall |
41
- 47 |
Removed
fireplaces and tiles; large big waves, thick wakes of foam
and sprays, raised from the wind, reduce the visibility.
|
20.8
- 24.4 |
| 10
|
89
- 102 |
tempest
|
48
- 55 |
Rare
in mainland, trees uprooted, serious damages to the rooms;
enormous big waves with long crests to spandrel.
|
24.5
- 28.4 |
| 11
|
103
- 117 |
storm
|
56
- 63 |
Rare,
most serious devastations; enormous and high waves, that they
can hide ships of medium tonnage; reduced visibility.
|
28.5
- 32.6 |
| 12
|
over
118 |
hurricane
|
64
+ |
Destruction
of buildings, manufactured, etc; in sea the foam and the sprays
reduce the visibility much.
|
32.7
+ |
