HotRIBS - The online RIB Magazine
 
 
[ article ]
  #034
01. The Beufort Scale
All extracts courtesy of the MarineCall Guide
 
Force
(Knots)
(Km/h)
(m/Sec)
Description
Sea State
Probable Wave Height (m)
0
0-1
0-2
0-0.5
Calm
Like a mirror
0
1
1-3
2-6
0.5-1.5
Light Air
Ripples like scales are formed
0
2
4-6
7-11
2-3
Light Breeze
Small wavelets, still short but more pronounced, not breaking
0.1
3
7-10
13-19
4-5
Gentle Breeze
Large wavelets, crests begin to break; a few whitehorses
0.4
4
11-16
20-30
6-8
Moderate Breeze
Small waves growing longer; fairly frequent white horses
1
5
17-21
31-39
8-11
Fresh Breeze
Moderate waves taking more pronounced form; many white horses. Perhaps some spray
2
6
22-27
41-50
11-14
Strong Breeze
Large waves forming; white
breeze foam crests more extensive;
probably some spray
3
7
28-33
52-61
14-17
Near Gale
Sea heaps up; white foam
from breaking waves begins
to blow in streaks.
4
8
34-40
63-74
17-21
Gale
Moderately high waves of
greater length; edge of crests
break into spindrift; foam
blown in well-marked streaks
5.5
9
41-47
76-87
21-24
Severe Gale
High waves with tumbling
crests; dense streaks of foam
spray may affect visibility
7
10
48-55
89-102
25-28
Storm
Very high waves with long
overhanging crests; dense
streams of foam make surface
of sea white. Heavy tumbling
sea; visibility affected.
9
11
56-63
104-117
29-33
Violent Storm
Exceptionally high waves; sea
completely covered with long
white patches of foam; edges
of wave crests blown into froth.
Visibility affected.
11
12
64+
118+
33+
Hurricane
Air filled with foam and spray;
sea completely white with
driving spray; visibility very
seriously affected
14
Force
(Knots)
(Km/h)
(m/Sec)
Description
Sea State
Probable Wave Height (m)