Senin, 03 Desember 2012

BEAUFORT WIND SCALE




FOR AN EFFECTIVE HEIGHT OF 10 M ABOVE SEA LEVEL


BEAUFORT NUMBER

DESCRIPTIVE
TERM
MEAN WIND SPEED
EQUIVALENT

DEEP SEA CRITERION
PROBABLE MEAN WAVE
HEIGHT IN METRES

KNOTS

M/SEC
0
CALM
< 1
0 – 0.2
SEA LIKE A MIRROR
-
1
LIGHT AIR
1 – 3
0.3 – 1.5
RIPPLES WITH THE APPEARANCE OF SCALE ARE FORMED, BUT WITHOUT FOAM CRESTS
0.1 (0.1 )
2
LIGHT BREEZE
4 – 6
1.6 – 3.3
SMALL WAVELETS,STILL SHORT BUT MORE PRONOUNCED,CREST HAVE A GLASSY APPEARANCE AND DO NOT BREAK
0.2 ( 0.3 )
3
GENTLE BREEZE
7 – 10
3.4 – 5.4
LARGE WAVELETS,CRESTS BEGIN TO BREAK ,FOAM OF GLASSY APPEARANCE ,PERHAPS SCATTERED WHITE HORSES
0.6 ( 1 )
4
MODERATE BREEZE
11 – 16
5.5 – 7.9
SMALL WAVES, BECOMING LONGER , FAIRLY FREQUENT WHITE HORSES
  1 ( 1.5 )
5
FRESH BREEZE
17 – 21
8.0 – 10.7
MODERATE WAVES,TAKING A MORE PRONOUNCED LONG FORM, MANY WHITE HORSES ARE FORMED (CHANCE OF SOME SPRAY)
2 ( 2.5 )
6
STRONG BREEZE
22 – 27
10.8 – 13.8
LARGE WAVES BEGIN TO FORM,THE WHITE FOAM CRESTS ARE EXTENSIVE EVERYWHERE (PROBABLY SOME SPRAY)
3 ( 4 )
7
NEAR GALE
28 – 33
13.9 – 17.1
SEA HAPS UP AND WHITE FOAM FROM BREAKING WAVES BEGINS TO BE BLOWN IN STREAKS ALONG THE DIRECTION OF THE WIND
4 ( 5.5 )
8
GALE
34 – 40
17.2 – 20.7
MODERATELY HIGH WAVES OF GREATER LENGTH, EDGES OF CRESTS BEGIN TO BREAK INTO SPINDRIFT, FOAM IS BLOWN IN WELL-MARKED STREAKS ALONG THE DIRECTION OF THE WIND
5.5 ( 7.5 )
9
STRONG GALE
41 – 47
20.8 – 24.4
HIGH WAVES, DENSE STREAKS OF FOAM ALONG THE DIRECTION OF THE WIND , CRESTS OF WAVE BEGIN TO TOPPLE,TUMBLE AND ROLL OVER, SPRAY MAY AFFECT VISIBILITY
7 ( 10 )
10
STROM
48 – 55
24.5 – 28.4
VERY HIGH WAVES WITH LONG OVERHANGING CRESTS,THE RESULTING FOAM,IN GREAT PATCHES, IS BLOWN IN DENSE WHITE STREAKS ALONG THE DIRECTION OF THE WIND , ON T47HE WHOLE, THE SURFACE OF THE SEA TAKES A WHITE APPEARANCE, THE TUMBLING OF THE SEA BECOMES HEAVY AND SHOCK-LIKE, VISIBILITY AFFECTED
9 ( 12.5 )
11
VIOLENT STROM
56 – 63
28.5 – 32.6
EXCEPTIONALLY HIGH WAVES(SMALL AND MEDIUM SIZED SHIPS MIGHT BE FOR A TIME LOST TO WIEW 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 WAVES CRESTS ARE BLOWN INTO FROTH, VISIBILITY AFFECTED
11.5 ( 16 )
12
HURRICANE
64  and over
32.7 and over
THE AIR IS FILLED WITH FOAM AND SPRAY, SEA COMPLETELY WHITE DRIVING SPRAY, VISIBILITY SERIOUSLY AFFECTED.
14 ( - )







0 Komentar:

Poskan Komentar

Berlangganan Poskan Komentar [Atom]

<< Beranda