Weather Code Table for Wave Data

Weather Code Table for Wave Data

Windforce (Beaufort wind scale)

Code	Description	Knots	m/s
0	Calm	0- 0.9	0 - 0.2
1	Light air	1- 3	0.3- 1.5
2	Light breeze	4- 6	1.6- 3.3
3	Gentle breeze	7- 10	3.4- 5.4
4	Moderate breeze	11- 16	5.5- 7.9
5	Fresh breeze	17- 21	8.0-10.7
6	Strong breeze	22- 27	10.8-13.8
7	Near gale	28- 33	13.9-17.1
8	Gale	34- 40	17.2-20.7
9	Strong gale	41- 47	20.8-24.4
10	Storm	48- 55	24.5-28.4
11	Violent storm	56- 63	28.5-32.6
12	Hurricane	Over 64	Over 32.7

Sea State

Code	Description	Height(m)
0	Calm-glassy	0
1	Calm-rippled	0 - 0.10
2	Smooth-wavelet	0.10 - 0.50
3	Slight	0.50 - 1.25
4	Moderate	1.25 - 2.50
5	Rough	2.50 - 4
6	Very rough	4 - 6
7	High	6 - 9
8	Very high	9 - 14
9	Phenomenal	Over 14

Swell

Code	Descriptions
0	No swell
1	Low swell Wavelength : Less than 200m Waveheight : Less than 2m Waveperiod : Less than 11.3 sec.
2	Low swell Wavelength : More than 200m Waveheight : Less than 2m Waveperiod : More than 11.4 sec.
3	Moderate swell Wavelength : Less than 100m Waveheight : 2m to 4m Waveperiod : Less than 8.0 sec.
4	Moderate swell Wavelength : 100m to 200m Waveheight : 2m to 4m Waveperiod : 8.1 to 11.3 sec.
5	Moderate swell Wavelength : More than 200m Waveheight : 2m to 4m Waveperiod : More than 11.4 sec.
6	Heavy swell Wavelength : Less than 100m Waveheight : Over 4m Waveperiod : Less than 8.0 sec.
7	Heavy swell Wavelength : 100m to 200m Waveheight : Over 4m Waveperiod : 8.1 to 11.3 sec.
8	Heavy swell Wavelength : More than 200m Waveheight : Over 4m Waveperiod : More than 11.4 sec.
9	Confused swell

Present Weather

Code
B	Blue sky whether with clear or hazy atmosphere, or sky not more than 1/10 clouded.
BC	Sky between 2/10 and 8/10 clouded.
C	Mainly cloudy (not less than 9/10 covered).
O	Overcast sky (i.e., the whole sky covered with unbroken cloud).
Z	Dust haze; the turbid atmosphere or dry weather.
F	Fog.
D	Drizzle or fine rain.
R	Rain.
RS	Sleet (i.e., rain and snow together).
S	Snow.
H	Hail.
T	Thunder.
XX	Unspecified.

Cloud type

Code	Descriptions
Ci	Cirrus
Cc	Cirrocumulus
Cs	Cirrostratus
Ac	Altocumulus
As	Altostratus
Ns	Nimbostratus
Sc	Stratocumulus
St	Stratus
Cu	Cumulus
Cb	Cumulonimbus
XX	Cloud not visible owing to darkness, fog, duststorm, sandstorm, or other analogous phenomena

Visibility

Code	Descriptions
0	Less than 50m
1	50m - 200m
2	200m - 500m
3	500m - 1km
4	1km - 2km
5	2km - 4km
6	4km - 10km
7	10km - 20km
8	20km - 50km
9	50km or more

Last update : September 24, 1997