:: Windspeed
table for Conversion of Knots, Beaufort, m/s and km/h.
|
| Knots |
Bft. |
m/s |
km/h |
Label |
Effect
on sea |
| 1 |
0 |
0
- 0,2 |
1 |
Calm |
Sea
like a mirror |
| 1-3 |
1 |
0,3-1,5 |
1-5 |
Light
Air |
Ripples
with the appearance of scales are formed, but without foam
crests |
| 4-6 |
2 |
1,6-3,3 |
6-11 |
Light
Breeze |
Small
wavelets, still short, but more pronounced. Crests have a
glassy appearance and do not break |
| 7-10 |
3 |
3,4-5,4 |
12-19 |
Gentle
Breeze |
Large
wavelets. Crests begin to break. Foam of glassy appearance.
Perhaps scattered white horses |
| 11-15 |
4 |
5,5-7,9 |
20-28 |
Moderate
Breeze |
Small
waves, becoming larger; fairly frequent white horses |
| 16-21 |
5 |
8,0-10,7 |
29-38 |
Fresh
Breeze |
Moderate
waves, taking a more pronounced long form; many white
horses are formed. Chance of some spray |
| 22-27 |
6 |
10,8-13,8 |
39-49 |
Strong
Breeze |
Large
waves begin to form; the white foam crests are more
extensive everywhere. Probably some spray |
| 28-33 |
7 |
13,9-17,1 |
50-61 |
Near
Gale |
Sea
heaps up and white foam from breaking waves begins to be
blown in streaks along the direction of the wind |
| 34-40 |
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 |
| 41-47 |
9 |
20,8-24,4 |
75-88 |
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 |
| 48-55 |
10 |
24,5-28,4 |
89-102 |
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 |
| 56-63 |
11 |
28,5-32,6 |
103-117 |
Violent
Storm |
Exceptionally
high waves (small and medium-size ships might be for
a time East 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 |
| 64-71 |
12 |
32,7-36,9 |
118-133 |
Hurricane |
The
air is filled with foam and spray. Sea completely white
with driving spray; visibility very seriously affected |
|
|