Surface Synoptic Observations
Table of Contents
- Surface Observations
Syntax
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
000 Group - Identification and Location
IIiiiThe WMO number of the station.
Ship or Buoy Observations:IIIIIThe ship or buoy identifierYYGGiYY-- The day of the monthGG-- The hour of the observation (UTC)iw-- Wind type indicator0 -- 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 observation1 -- North east
3 -- South east
5 -- South west
7 -- North westLLLL-- Longitude of observation to .1 degrees
111 Group - Land Observations
iihVViR-- Precipitation indicator0 -- 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 observationix-- Station type and present and past weather indicator1 -- 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
/ -- unknownVV-- Visibility00 -- 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
// -- missingNddffN-- Total cloud cover0 -- 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 observationdd-- wind direction in 10s of degreesff-- wind speed in units determined by wind type indicator (see above)00fff(optional)fff-- wind speed if value greater than 1001sTTT-- Temperatures-- sign of temperature (0=positive, 1=negative)TTT-- Temperature in .1 C2sTTT-- 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 level1 -- 1000 mb
2 -- 925 mb
5 -- 500 mb
7 -- 700 mb
8 -- 850 mbhhh-- geopotential height omitting thousandths digit5appp-- Pressure tendency over 3 hoursa-- characteristics of pressure tendency0 -- 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 lowerppp-- 3 hour pressure change in 0.1 mb6RRRt-- Liquid precipitationRRR-- Precipitation amount in mm001 -- 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 mmt-- Duration over which precipitation amount measured1 -- 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 hours7wwWW-- Present and past weatherww-- Present weather00 -- 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 hailW1-- 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 -- thunderstorms8NCCC-- Cloud type informationN-- Amount of low clouds covering sky, if no low clouds, the amount of the middle cloudsCL-- Low cloud type0 -- 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 obscurationCM-- Middle cloud type0 -- 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 obscurationCH-- High cloud type0 -- 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 obscuration9GGgg-- Time of observation in hours and minutes
222 Group - Sea Surface Observations
222DvD-- direction of ship movement0 -- calm
1 -- NE
2 -- E
3 -- SE
4 -- S
5 -- SW
6 -- W
7 -- NW
8 -- N
9 -- unknownv-- ship's average speed0 -- 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 knots0sTTT-- Sea surface temperatures-- sign of temperature (0=positive, 1=negative)TTT-- Temperature in .1 C1PPHH-- Wave heights in 0.5 m incrementsPP-- Period of waves in secondsHH-- Height of waves in 0.5 m increments2PPHH-- Wave period and heights (instrumented)3dddd-- Direction of swells (up to 2 swells)4PPHH-- Period and direction of first set of swells5PPHH-- Period and direction of second set of swells6IEER-- Ice accretion on ships70HHH-- Wave heights to 0.1 m (instrumented)8aTTT-- Wet bulb temperature
333 Group - Special / Climatological Data
0....-- Regionally developed data1sTTT-- Maximum temperature over previous 24 hourss-- sign of temperature (0=positive, 1=negative)TTT-- Temperature in .1 C2sTTT-- Minimum temperature over previous 24 hourss-- sign of temperature (0=positive, 1=negative)TTT-- Temperature in .1 C3Ejjj-- Regionally developed data4Esss-- Snow depthE-- State of ground with snow cover0 -- 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 driftssss-- snow depth in cm5jjjj jjjjj-- Additional information (can be multiple groups)6RRRt-- Liquid precipitationRRR-- Precipitation amount in mm001 -- 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 mmt-- Duration over which precipitation amount measured1 -- 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 hours7RRRR-- 24 hour precipitation in mm8NChh-- Cloud layer dataN-- cloud coverage of layerC-- genus of cloud0 -- 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 visiblehh-- height of cloud base00 -- 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 m9SSss-- Supplementary information
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