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:: Windspeed
table for Conversion of Knots, Beaufort, m/s and km/h.
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|
Knots
|
Bft.
|
m/s
|
km/h
|
Label
|
Effect on sea
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|
1
|
0
|
0 - 0,2
|
1
|
Calm
|
Sea like a
mirror
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|
1-3
|
1
|
0,3-1,5
|
1-5
|
Light Air
|
Ripples
with the appearance of scales are formed, but without foam crests
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4-6
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2
|
1,6-3,3
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6-11
|
Light
Breeze
|
Small
wavelets, still short, but more pronounced. Crests have a glassy
appearance and do not break
|
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7-10
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3
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3,4-5,4
|
12-19
|
Gentle
Breeze
|
Large
wavelets. Crests begin to break. Foam of glassy appearance. Perhaps
scattered white horses
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11-15
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4
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5,5-7,9
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20-28
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Moderate
Breeze
|
Small
waves, becoming larger; fairly frequent white horses
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16-21
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5
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8,0-10,7
|
29-38
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Fresh
Breeze
|
Moderate
waves, taking a more pronounced long form; many white horses are formed.
Chance of some spray
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22-27
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6
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10,8-13,8
|
39-49
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strong
Breeze
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Large
waves begin to form; the white foam crests are more extensive everywhere.
Probably some spray
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|
28-33
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7
|
13,9-17,1
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50-61
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Near Gale
|
Sea heaps
up and white foam from breaking waves begins to be blown in streaks along
the direction of the wind
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34-40
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8
|
17,2-20,7
|
62-74
|
Gale
|
Moderately
high waves of greater length; edges of crests begin to break into
spindrift. The foam is blown in well-marked streaks along the direction
of the wind
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41-47
|
9
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20,8-24,4
|
75-88
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Severe
Gale
|
High
waves. Dense streaks of foam along the direction of the wind. Crests of
waves begin to topple, tumble and roll over. Spray may affect visibility
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48-55
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10
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24,5-28,4
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89-102
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Storm
|
Very high
waves with long over-hanging crests. The resulting foam, in great
patches, is blown in dense white streaks along the direction of the wind.
On the whole the surface of the sea takes on a white appearance. The
'tumbling' of the sea becomes heavy and shock-like. Visibility affected
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56-63
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11
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28,5-32,6
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103-117
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Violent
Storm
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Exceptionally
high waves (small and medium-size ships might be for
a time lEast to view behind the waves). The sea is completely covered
with long white patches of foam lying along the direction of the wind.
Everywhere the edges of the wave crests are blown into froth. Visibility
affected
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64-71
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12
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32,7-36,9
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118-133
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Hurricane
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The air is
filled with foam and spray. Sea completely white with driving spray;
visibility very seriously affected
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:: Wind directions
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|
Abbreviation
|
wind direction
|
Degrees
|
Wind rose
|
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N
|
North
|
0°
|
|
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NNE
|
NorthNorthEast
|
22.5°
|
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NO
|
NorthEast
|
45°
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|
ENE
|
EastNorthEast
|
67.5°
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|
E
|
East
|
90°
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|
ESE
|
EastSouthEast
|
112.5°
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SE
|
SouthEast
|
135°
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SSE
|
SouthSouthEast
|
157.5°
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S
|
South
|
180°
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SSW
|
SouthSouthwest
|
202.5°
|
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SW
|
Southwest
|
225°
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WSW
|
WestSouthwest
|
247.5°
|
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W
|
West
|
270°
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WNW
|
WestNorthwest
|
292.5°
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NW
|
Northwest
|
315°
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NNW
|
NorthNorthwest
|
337.5°
|
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