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Beaufort windscale
1. Dia 1
mu2. Dia 2
FORCE 0: CALMMEAN WIND SPEED: LESS THAN 1 KNOT
Sea is like a mirror.
3. Dia 3
FORCE 1: LIGHT AIRMEAN WIND SPEED: 1 - 3 KNOTS
Ripples with the appearance of scales are formed,
but without foam crests.
4. Dia 4
FORCE 2: LIGHT BREEZEMEAN WIND SPEED: 4 - 6 KNOTS
Small wavelets, still short but more pronounced;
crests have glassy appearance and do not break.
5. Dia 5
FORCE 3: GENTLE BREEZEMEAN WIND SPEED: 7 - 10 KNOTS
Large wavelets; crests begin to break; foam of
glassy appearance; perhaps scattered white horses.
6. Dia 6
FORCE 4: MODERATE BREEZEMEAN WIND SPEED: 11 - 16 KNOTS
Small waves, becoming longer; fairly frequent
white horses.
7. Dia 7
FORCE 5: FRESH BREEZEMEAN WIND SPEED: 17 - 21 KNOTS
Moderate waves, taking a more pronounced long form;
many white horses are formed (chance of some spray).
8. Dia 8
9. Dia 9
10. Dia 10
FORCE 6: STRONG BREEZEMEAN WIND SPEED: 22 - 27 KNOTS
Large waves begin to form; the white foam crests are
more extensive everywhere (probably some spray).
11. Dia 11
FORCE 7: NEAR GALEMEAN WIND SPEED: 28 - 33 KNOTS
The sea heaps up and white foam from breaking waves
begins to be blown in streaks along the direction of
the wind.
12. Dia 12
13. Dia 13
FORCE 8: GALEMEAN WIND SPEED: 34 - 40 KNOTS
Moderately high waves of greater length; edges of
the crests begin to break into spindrift; foam is blown in
well-marked streaks along the direction of the wind.
14. Dia 14
FORCE 9: STRONG GALEMEAN WIND SPEED: 41 - 47 KNOTS
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.
15. Dia 15
16. Dia 16
FORCE 10: STORMMEAN WIND SPEED: 48 - 55 KNOTS
Very high waves with long overhanging crests; foam in great patches
is blown in dense white streaks along the direction of the wind;
the surface of the sea takes a white appearance; the tumbling of
the sea becomes heavy and shocklike; visibility affected.
17. Dia 17
18. Dia 18
FORCE 11: VIOLENT STORMMEAN WIND SPEED:56 - 63 KNOTS
VIDEO
(click)
Phenominal
waves!!
Exceptionally high waves (small and medium sized ships
might be lost to view behind the waves); sea 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.
19. Dia 19
FORCE 12: HURRICANEMEAN WIND SPEED: 64 KNOTS AND OVER
The air is filled with foam and spray; sea completely
white with driving spray; visibility very seriously affected.
20. Dia 20
FORCE 12:Saffir/Simpson Scale - categories and damage.
Category 1: 64 - 83 knots
Damage: minimal.
Category 2 : 84 - 96 knots
Damage: moderate.
Category 3 : 97 - 113 knots
Damage: extensive.
Category 4 : 114 - 135 knots
Damage: extreme.
Category 5 : >136 knots
Damage: catastrophic.
21. Dia 21
TheInternational Maritime Language Programme – IMLP
C
The IMLP is an IMO-standard.
P.C. van Kluijven