IIiii
or IIIII
YYGGi
99LLL
QLLLL
iihVV
Nddff
00fff 1sTTT
2sTTT
3PPPP
4PPPP
5appp
6RRRt
7wwWW
8NCCC
9GGgg
222Dv
0sTTT
1PPHH
2PPHH
3dddd
4PPHH
5PPHH
6IEER
70HHH
8aTTT
333
0....
1sTTT
2sTTT
3Ejjj
4Esss
5jjjj
jjjjj 6RRRt
7RRRR
8Nchh
9SSss
IIiii The WMO number of the
station.IIIII The ship or buoy identifier
YYGGi YY --
The day of the monthGG -- The hour of the
observation (UTC)iw -- Wind type indicator
0 -- m/s (estimated)
1 -- m/s (from anemometer)
2 -- knots (estimated)
3 -- knots (from anemometer)
99LLL
QLLLLLLL -- Latitude of observation to
.1 degreesQ -- Quadrant of observation
1 -- North east
3 -- South east
5 -- South west
7 -- North west
LLLL -- Longitude of observation to .1 degrees
iihVViR --
Precipitation indicator
0 -- Precipitation in groups 1 and 3
1 -- Precipitation reported in group 1 only
2 -- Precipitation reported in group 3 only
3 -- Precipitation omitted, no precipitation
4 -- Precipitation omitted, no observation
ix -- Station type and present and past
weather indicator
1 -- manned station -- weather group included
2 -- manned station -- omitted, no significant weather
3 -- manned station -- omitted, no weather observation
4 -- automated station -- weather group included (see automated weather codes 4677 and 4561)
5 -- automated station -- omitted, no significant weather
6 -- automated station -- omitted, no weather observation
7 -- automated station -- weather group included (see automated weather codes 4680 and 4531)
h -- Cloud base of lowest cloud seen (meters above
ground)
0 -- 0 to 50 m
1 -- 50 to 100 m
2 -- 100 to 200 m
3 -- 200 to 300 m
4 -- 300 to 600 m
5 -- 600 to 1000 m
6 -- 1000 to 1500 m
7 -- 1500 to 2000 m
8 -- 2000 to 2500 m
9 -- above 2500 m
/ -- unknown
VV -- Visibility
00 -- less than 0.1 km
01 -- 0.1 km
02 -- 0.2 km
...
50 -- 5.0 km
56 -- 6 km
57 -- 7 km
...
80 -- 30 km
81 -- 35 km
82 -- 40 km
83 -- 45 km
84 -- 50 km
85 -- 55 km
86 -- 60 km
87 -- 65 km
88 -- 70 km
89 -- greater than 70 km
90 -- less than 0.05 km
91 -- 0.05 km
92 -- 0.2 km
93 -- 0.5 km
94 -- 1 km
95 -- 2 km
96 -- 4 km
97 -- 10 km
98 -- 20 km
99 -- greater than 50 km
// -- missing
NddffN --
Total cloud cover
0 -- 0 eighths (clear)
1 -- 1/8th
2 -- 2/8ths
3 -- 3/8ths
4 -- 4/8ths
5 -- 5/8ths
6 -- 6/8ths
7 -- 7/8ths
8 -- 8/8ths (overcast)
9 -- sky obscured
/ -- no observation
dd -- wind direction in 10s of degrees
ff -- wind speed in units determined by wind type
indicator (see above)
00fff
(optional)fff -- wind speed if value greater than 100
1sTTT --
Temperatures -- sign of temperature (0=positive,
1=negative)TTT -- Temperature in .1 C
2sTTT --
Dewpoints -- sign of temperature (0=positive,
1=negative, 9 = RH)TTT -- Dewpoint temperature in .1 C
(if sign is 9, TTT is relative humidity)
3PPPP -- Station pressure in 0.1 mb
(thousandths digit omitted, last digit can be slash, then pressure in full mb)
4PPPP -- Sea level pressure in 0.1 mb
(thousandths digit omitted, last digit can be slash, then pressure in full
mb)4ahhh -- Geopotential of nearest mandatory pressure
level (use for high altitude stations where sea level pressure reduction is
not accurate)a3 -- mandatory pressure level
1 -- 1000 mb
2 -- 925 mb
5 -- 500 mb
7 -- 700 mb
8 -- 850 mb
hhh -- geopotential height omitting thousandths digit
5appp -- Pressure tendency over 3
hoursa -- characteristics of pressure tendency
0 -- Increasing, then decreasing -- resultant pressure same or higher
1 -- Increasing, then steady -- resultant pressure higher
2 -- Increasing steadily -- resultant pressure higher
3 -- Decreasing or steady, then increasing -- resultant pressure higher
4 -- Steady -- resultant pressure same
5 -- Decreasing, then increasing -- resultant pressure lower
6 -- Decreasing, then steady -- resultant pressure lower
7 -- Decreasing steadily -- resultant pressure lower
8 -- Increasing or steady, then decreasing -- resultant pressure lower
ppp -- 3 hour pressure change in 0.1 mb
6RRRt -- Liquid
precipitationRRR -- Precipitation amount in mm
001 -- 1 mm
002 -- 2 mm
...
988 -- 988 mm
989 -- 989 or more mm
990 -- Trace
991 -- 0.1 mm
992 -- 0.2 mm
...
999 -- 0.9 mm
t -- Duration over which precipitation amount measured
1 -- 6 hours
2 -- 12 hours
3 -- 18 hours
4 -- 24 hours
5 -- 1 hour
6 -- 2 hours
7 -- 3 hours
8 -- 9 hours
9 -- 15 hours
/ -- 24 hours
7wwWW -- Present and past
weatherww -- Present weather
00 -- clear skies
01 -- clouds dissolving
02 -- state of sky unchanged
03 -- clouds developing
Haze, smoke, dust or sand
04 -- visibility reduced by smoke
05 -- haze
06 -- widespread dust in suspension not raised by wind
07 -- dust or sand raised by wind
08 -- well developed dust or sand whirls
09 -- dust or sand storm within sight but not at station
Non-precipitation events
10 -- mist
11 -- patches of shallow fog
12 -- continuous shallow fog
13 -- lightning visible, no thunder heard
14 -- precipitation within sight but not hitting ground
15 -- distant precipitation but not falling at station
16 -- nearby precipitation but not falling at station
17 -- thunderstorm but no precipitation falling at station
18 -- squalls within sight but no precipitation falling at station
19 -- funnel clouds within sight
Precipitation within past hour but not at observation time
20 -- drizzle
21 -- rain
22 -- snow
23 -- rain and snow
24 -- freezing rain
25 -- rain showers
26 -- snow showers
27 -- hail showers
28 -- fog
29 -- thunderstorms
Duststorm, sandstorm, drifting or blowing snow
30 -- slight to moderate duststorm, decreasing in intensity
31 -- slight to moderate duststorm, no change
32 -- slight to moderate duststorm, increasing in intensity
33 -- severe duststorm, decreasing in intensity
34 -- severe duststorm, no change
35 -- severe duststorm, increasing in intensity
36 -- slight to moderate drifting snow, below eye level
37 -- heavy drifting snow, below eye level
38 -- slight to moderate drifting snow, above eye level
39 -- heavy drifting snow, above eye level
Fog or ice fog
40 -- Fog at a distance
41 -- patches of fog
42 -- fog, sky visible, thinning
43 -- fog, sky not visible, thinning
44 -- fog, sky visible, no change
45 -- fog, sky not visible, no change
46 -- fog, sky visible, becoming thicker
47 -- fog, sky not visible, becoming thicker
48 -- fog, depositing rime, sky visible
49 -- fog, depositing rime, sky not visible
Drizzle
50 -- intermittent light drizzle
51 -- continuous light drizzle
52 -- intermittent moderate drizzle
53 -- continuous moderate drizzle
54 -- intermittent heavy drizzle
55 -- continuous heavy drizzle
56 -- light freezing drizzle
57 -- moderate to heavy freezing drizzle
58 -- light drizzle and rain
59 -- moderate to heavy drizzle and rain
Rain
60 -- intermittent light rain
61 -- continuous light rain
62 -- intermittent moderate rain
63 -- continuous moderate rain
64 -- intermittent heavy rain
65 -- continuous heavy rain
66 -- light freezing rain
67 -- moderate to heavy freezing rain
68 -- light rain and snow
69 -- moderate to heavy rain and snow
Snow
70 -- intermittent light snow
71 -- continuous light snow
72 -- intermittent moderate snow
73 -- continuous moderate snow
74 -- intermittent heavy snow
75 -- continuous heavy snow
76 -- diamond dust
77 -- snow grains
78 -- snow crystals
79 -- ice pellets
Showers
80 -- light rain showers
81 -- moderate to heavy rain showers
82 -- violent rain showers
83 -- light rain and snow showers
84 -- moderate to heavy rain and snow showers
85 -- light snow showers
86 -- moderate to heavy snow showers
87 -- light snow/ice pellet showers
88 -- moderate to heavy snow/ice pellet showers
89 -- light hail showers
90 -- moderate to heavy hail showers
Thunderstorms
91 -- thunderstorm in past hour, currently only light rain
92 -- thunderstorm in past hour, currently only moderate to heavy rain
93 -- thunderstorm in past hour, currently only light snow or rain/snow mix
94 -- thunderstorm in past hour, currently only moderate to heavy snow or rain/snow mix
95 -- light to moderate thunderstorm
96 -- light to moderate thunderstorm with hail
97 -- heavy thunderstorm
98 -- heavy thunderstorm with duststorm
99 -- heavy thunderstorm with hail
W1 -- Past weather (type
1)W2 -- Past weather (type 2)
0 -- cloud covering less than half of sky
1 -- cloud covering more than half of sky during part of period and more than half during part of period
2 -- cloud covering more thna half of sky
3 -- sandstorm, duststorm or blowing snow
4 -- fog, or thick haze
5 -- drizzle
6 -- rain
7 -- snow or mixed rain and snow
8 -- showers
9 -- thunderstorms
8NCCC -- Cloud type
informationN -- Amount of low clouds covering sky, if
no low clouds, the amount of the middle
cloudsCL -- Low cloud type
0 -- no low clouds
1 -- cumulus humulis or fractus (no vertical development)
2 -- cumulus mediocris or congestus (moderate vertical development)
3 -- cumulonimbus calvus (no outlines nor anvil)
4 -- stratocumulus cumulogenitus (formed by spreading of cumulus)
5 -- stratocumulus
6 -- stratus nebulosus (continuous sheet)
7 -- stratus or cumulus fractus (bad weather)
8 -- cumulus and stratocumulus (multilevel)
9 -- cumulonimbus with anvil
/ -- low clouds unobserved due to darkness or obscuration
CM -- Middle cloud type
0 -- no middle clouds
1 -- altostratus translucidous (mostly transparent)
2 -- altostratus opacus or nimbostratus
3 -- altocumulus translucidous (mostly transparent)
4 -- patches of altocumulus (irregular, lenticular)
5 -- bands of altocumulus
6 -- altocumulus cumulogenitus (formed by spreading of cumulus)
7 -- altocumulus (multilayers)
8 -- altocumulus castellanus (having cumuliform tufts)
9 -- altocumulus of a chaotic sky
/ -- middle clouds unobserved due to darkness or obscuration
CH -- High cloud type
0 -- no high clouds
1 -- cirrus fibratus (wispy)
2 -- cirrus spissatus (dense in patches)
3 -- cirrus spissatus cumulogenitus (formed out of anvil)
4 -- cirrus unicus or fibratus (progressively invading sky)
5 -- bands of cirrus or cirrostratus invading sky (less than 45 degree above horizon)
6 -- bands of cirrus or cirrostratus invading sky (more than 45 degree above horizon)
7 -- cirrostratus covering whole sky
8 -- cirrostratus not covering sky but not invading
9 -- cirrocumulus
/ -- high clouds unobserved due to darkness or obscuration
9GGgg -- Time of observation in hours
and minutes
222Dv D --
direction of ship movement
0 -- calm
1 -- NE
2 -- E
3 -- SE
4 -- S
5 -- SW
6 -- W
7 -- NW
8 -- N
9 -- unknown
v -- ship's average speed
0 -- 0 knots
1 -- 1 to 5 knots
2 -- 6 to 10 knots
3 -- 11 to 15 knots
4 -- 16 to 20 knots
5 -- 21 to 25 knots
6 -- 26 to 30 knots
7 -- 31 to 35 knots
8 -- 36 to 40 knots
9 -- over 40 knots
0sTTT -- Sea surface
temperatures -- sign of temperature (0=positive,
1=negative)TTT -- Temperature in .1 C
1PPHH -- Wave heights in 0.5 m
increments PP -- Period of waves in
secondsHH -- Height of waves in 0.5 m increments
2PPHH -- Wave period and heights
(instrumented)
3dddd -- Direction of swells (up to 2
swells)
4PPHH -- Period and direction of first
set of swells
5PPHH -- Period and direction of second
set of swells
6IEER -- Ice accretion on ships
70HHH -- Wave heights to 0.1 m
(instrumented)
8aTTT -- Wet bulb temperature
0.... -- Regionally developed data
1sTTT -- Maximum temperature over
previous 24 hourss -- sign of temperature (0=positive,
1=negative)TTT -- Temperature in .1 C
2sTTT -- Minimum temperature over
previous 24 hourss -- sign of temperature (0=positive,
1=negative)TTT -- Temperature in .1 C
3Ejjj -- Regionally developed data
4Esss -- Snow depth
E -- State of ground with snow cover
0 -- predominantly covered with ice
1 -- compact or wet snow covering less than half of ground
2 -- compact or wet snow covering more than half of ground but not completely covered
3 -- even layer of compact or wet snow covering entire ground
4 -- uneven layer of compact or wet snow covering entire ground
5 -- loose dry snow covering less than half of ground
6 -- loose dry snow covering more than half of ground but not completely covered
7 -- even layer of loose dry snow covering entire ground
8 -- uneven layer of loose dry snow covering entire ground
9 -- snow covering ground completely with deep drifts
sss -- snow depth in cm
5jjjj jjjjj -- Additional information
(can be multiple groups)
6RRRt -- Liquid
precipitationRRR -- Precipitation amount in mm
001 -- 1 mm
002 -- 2 mm
...
988 -- 988 mm
989 -- 989 or more mm
990 -- Trace
991 -- 0.1 mm
992 -- 0.2 mm
...
999 -- 0.9 mm
t -- Duration over which precipitation amount measured
1 -- 6 hours
2 -- 12 hours
3 -- 18 hours
4 -- 24 hours
5 -- 1 hour
6 -- 2 hours
7 -- 3 hours
8 -- 9 hours
9 -- 15 hours
/ -- 24 hours
7RRRR -- 24 hour precipitation in mm
8NChh -- Cloud layer
dataN -- cloud coverage of
layerC -- genus of cloud
0 -- cirrus (Ci)
1 -- cirrocumulus (Cc)
2 -- cirrostratus (Cs)
3 -- altocumulus (Ac)
4 -- altostratus (As)
5 -- nimbostratus (Ns)
6 -- stratocumulus (Sc)
7 -- stratus (St)
8 -- cumulus (Cu)
9 -- cumulonimbus (Cb)
/ -- cloud not visible
hh -- height of cloud base
00 -- less than 30 m
01 -- 30 m (100 ft)
02 -- 60 m (200 ft)
03 -- 90 m (300 ft)
...
50 -- 1500 m (5000 ft)
56 -- 1800 m (6000 ft)
57 -- 2100 m (7000 ft)
...
80 -- 9000 m (30000 ft)
81 -- 10500 m
82 -- 12000 m
...
88 -- 21000 m
89 -- greater than 21000 m
90 -- 0 to 50 m
91 -- 50 to 100 m
92 -- 100 to 200 m
93 -- 200 to 300 m
94 -- 300 to 600 m
95 -- 600 to 1000 m
96 -- 1000 to 1500 m
97 -- 1500 to 2000 m
98 -- 2000 to 2500 m
99 -- above 2500 m
9SSss -- Supplementary information