Baufort

Knots

Km/hr

Term

Indications at Sea

0

0-0,2

0

0

Calm

like a mirror

1

0,3-1,5

1-3

2-5

Light air

Ripples with appearance of scales; no foam crests.

2

1,6-3,3

4-6

6-11

Light breeze

Small wavelets; crests of glassy appearance, not breaking.

3

3,4-5,4

7-10

12-18

Gentle Breeze

large wavelets; crests begin to break; scattered whitecaps

4

5,5-7,9

11-16

19-30

Moderate breeze

Small waves, becoming longer; numerous whitecaps.

5

8,0-10,7

17-21

31-39

Fresh breeze

Moderate waves, taking longer form; many whitecaps; some spray.

6

10,8-13,8

22-27

40-50

strong breeze

Larger waves forming;whitecaps ewerywhere; more spray

7

13,9-17,1

28-33

51-61

Near gale

Sea heaps up; white foam from breaking waves begins to be in streaks.

8

17,2-20,7

34-40

62-74

Gale

Moderately high waves of greater length; edges of crests begin to break into spindrift; foam is blown in wellmarked streaks

9

20,8-24,4

41-47

75-87

Strong gale

High waves; sea begins to roll; dense streaks of foam;spry may reduce visibility.

10

24,5-28,4

48-55

88-102

Storm

Very high waves with overhanging crests; sea takes white appearance as foam is blowing in very dense streaks; rolling is heavy and visibility is reduced.

11

28,5-32,6

56-63

103-117

Violent storm

Exeptionally high waves; sea covered with white foam patches; visibility futher reduced.

12

32,6-

63+

118-132

Hurricane

Air filled with foam; sea comletely white with driving spray; visibility greatly reduced.