Code/Flag Figure |
Description |
Status |
00
|
Characteristic change of the state of sky during the past hour
|
|
01
|
Characteristic change of the state of sky during the past hour
|
|
02
|
Characteristic change of the state of sky during the past hour
|
|
03
|
Characteristic change of the state of sky during the past hour
|
|
04
|
Visibility reduced by smoke, e.g. veldt or forest fires, industrial smoke or volcanic ashes
|
|
05
|
Haze
|
|
06
|
Widespread dust in suspension in the air, not raised by wind at or near the station at the time of observation
|
|
07
|
Dust or sand raised by wind at or near the station at the time of observation, but no well developed dust whirl(s) or sand whirl(s), and no duststorm or sandstorm seen; or, in the case of sea stations and coastal stations, blowing spray at the station
|
|
08
|
Well-developed dust whirl(s) or sand whirl(s) seen at or near the station during the preceding hour or at the same time of observation, but no duststorm or sandstorm
|
|
09
|
Duststorm or sandstorm within sight at the time of observation, or at the station during the preceding hour
|
|
10
|
Mist
|
|
11
|
shallow fog or ice fog at the station, whether on land or sea, not deeper than about 2 metres on land or 10 metres at sea
|
|
12
|
shallow fog or ice fog at the station, whether on land or sea, not deeper than about 2 metres on land or 10 metres at sea
|
|
13
|
Lightning visible, no thunder heard
|
|
14
|
Precipitation within sight, not reaching the ground or the surface of the sea
|
|
15
|
Precipitation within sight, reaching the ground or the surface of the sea, but distant, i.e. estimated to be more than 5 km from the station
|
|
16
|
Precipitation within sight, reaching the ground or the surface of the sea, near to, but not at the station
|
|
17
|
Thunderstorm, but no precipitation at the time of observation
|
|
18
|
at or within sight of the station during the preceding hour or at the time of observation
|
|
19
|
at or within sight of the station during the preceding hour or at the time of observation
|
|
20
|
not falling as shower(s)
|
|
21
|
not falling as shower(s)
|
|
22
|
not falling as shower(s)
|
|
23
|
not falling as shower(s)
|
|
24
|
not falling as shower(s)
|
|
25
|
not falling as shower(s)
|
|
26
|
Shower(s) of snow, or of rain and snow
|
|
27
|
Shower(s) of hail*, or of rain and hail
|
|
28
|
Fog or ice fog
|
|
29
|
Thunderstorm (with or without precipitation)
|
|
30
|
has decreased during the preceding hour
|
|
31
|
no appreciable change during the preceding hour
|
|
32
|
has begun or has increased during the preceding hour
|
|
33
|
has decreased during the preceding hour
|
|
34
|
no appreciable change during the preceding hour
|
|
35
|
has begun or has increased during the preceding hour
|
|
36
|
generally low (below eye level)
|
|
37
|
generally low (below eye level)
|
|
38
|
generally high (above eye level)
|
|
39
|
generally high (above eye level)
|
|
40
|
Fog or ice fog at a distance at the time of observation, but not at the station during the preceding hour, the fog or ice fog extending to a level above that of the observer
|
|
41
|
Fog or ice fog in patches
|
|
42
|
has become thinner during the preceding hour
|
|
43
|
has become thinner during the preceding hour
|
|
44
|
no appreciable change during the preceding hour
|
|
45
|
no appreciable change during the preceding hour
|
|
46
|
has begun or has become thicker during the preceding hour
|
|
47
|
has begun or has become thicker during the preceding hour
|
|
48
|
Fog, depositing rime, sky visible
|
|
49
|
Fog, depositing rime, sky invisible
|
|
50
|
slight at time of observation
|
|
51
|
slight at time of observation
|
|
52
|
moderate at time of observation
|
|
53
|
moderate at time of observation
|
|
54
|
heavy (dense) at time of observation
|
|
55
|
heavy (dense) at time of observation
|
|
56
|
Drizzle, freezing, slight
|
|
57
|
Drizzle, freezing, moderate or heavy (dense)
|
|
58
|
Drizzle and rain, slight
|
|
59
|
Drizzle and rain, moderate or heavy
|
|
60
|
slight at time of observation
|
|
61
|
slight at time of observation
|
|
62
|
moderate at time of observation
|
|
63
|
moderate at time of observation
|
|
64
|
heavy at time of observation
|
|
65
|
heavy at time of observation
|
|
66
|
Rain, freezing, slight
|
|
67
|
Rain, freezing, moderate or heavy
|
|
68
|
Rain or drizzle and snow, slight
|
|
69
|
Rain or drizzle and snow, moderate or heavy
|
|
70
|
slight at time of observation
|
|
71
|
slight at time of observation
|
|
72
|
moderate at time of observation
|
|
73
|
moderate at time of observation
|
|
74
|
heavy at time of observation
|
|
75
|
heavy at time of observation
|
|
76
|
Diamond dust (with or without fog)
|
|
77
|
Snow grains (with or without fog)
|
|
78
|
Isolated star-like snow crystals (with or without fog)
|
|
79
|
Ice pellets
|
|
80
|
Rain shower(s), slight
|
|
81
|
Rain shower(s), moderate or heavy
|
|
82
|
Rain shower(s), violent
|
|
83
|
Shower(s) of rain and snow mixed, slight
|
|
84
|
Shower(s) of rain and snow mixed, moderate or heavy
|
|
85
|
Snow shower(s), slight
|
|
86
|
Snow shower(s), moderate or heavy
|
|
87
|
slight
|
|
88
|
moderate or heavy
|
|
89
|
slight
|
|
90
|
moderate or heavy
|
|
91
|
Thunderstorm during the preceding hour but not at time of observation
|
|
92
|
Thunderstorm during the preceding hour but not at time of observation
|
|
93
|
Thunderstorm during the preceding hour but not at time of observation
|
|
94
|
Thunderstorm during the preceding hour but not at time of observation
|
|
95
|
Thunderstorm at time of observation
|
|
96
|
Thunderstorm at time of observation
|
|
97
|
Thunderstorm at time of observation
|
|
98
|
Thunderstorm at time of observation
|
|
99
|
Thunderstorm at time of observation
|
|
100
|
No significant weather observed
|
|
101
|
Clouds generally dissolving or becoming less developed during the past hour
|
|
102
|
State of sky on the whole unchanged during the past hour
|
|
103
|
Clouds generally forming or developing during the past hour
|
|
104
|
Haze or smoke, or dust in suspension in the air, visibility equal to, or greater than, 1 km
|
|
105
|
Haze or smoke, or dust in suspension in the air, visibility less than 1 km
|
|
110
|
Mist
|
|
111
|
Diamond dust
|
|
112
|
Distant lightning
|
|
118
|
Squalls
|
|
119
|
Reserved
|
|
120
|
Fog
|
|
121
|
PRECIPITATION
|
|
122
|
Drizzle (not freezing) or snow grains
|
|
123
|
Rain (not freezing)
|
|
124
|
Snow
|
|
125
|
Freezing drizzle or freezing rain
|
|
126
|
Thunderstorm (with or without precipitation)
|
|
127
|
BLOWING OR DRIFTING SNOW OR SAND
|
|
128
|
Blowing or drifting snow or sand, visibility equal to, or greater than, 1 km
|
|
129
|
Blowing or drifting snow or sand, visibility less than 1 km
|
|
130
|
FOG
|
|
131
|
Fog or ice fog in patches
|
|
132
|
Fog or ice fog, has become thinner during the past hour
|
|
133
|
Fog or ice fog, no appreciable change during the past hour
|
|
134
|
Fog or ice fog, has begun or become thicker during the past hour
|
|
135
|
Fog, depositing rime
|
|
140
|
PRECIPITATION
|
|
141
|
Precipitation, slight or moderate
|
|
142
|
Precipitation, heavy
|
|
143
|
Liquid precipitation, slight or moderate
|
|
144
|
Liquid precipitation, heavy
|
|
145
|
Solid precipitation, slight or moderate
|
|
146
|
Solid precipitation, heavy
|
|
147
|
Freezing precipitation, slight or moderate
|
|
148
|
Freezing precipitation, heavy
|
|
149
|
Reserved
|
|
150
|
DRIZZLE
|
|
151
|
Drizzle, not freezing, slight
|
|
152
|
Drizzle, not freezing, moderate
|
|
153
|
Drizzle, not freezing, heavy
|
|
154
|
Drizzle, freezing, slight
|
|
155
|
Drizzle, freezing, moderate
|
|
156
|
Drizzle, freezing, heavy
|
|
157
|
Drizzle and rain, slight
|
|
158
|
Drizzle and rain, moderate or heavy
|
|
159
|
Reserved
|
|
160
|
RAIN
|
|
161
|
Rain, not freezing, slight
|
|
162
|
Rain, not freezing, moderate
|
|
163
|
Rain, not freezing, heavy
|
|
164
|
Rain, freezing, slight
|
|
165
|
Rain, freezing, moderate
|
|
166
|
Rain, freezing, heavy
|
|
167
|
Rain (or drizzle) and snow, slight
|
|
168
|
Rain (or drizzle) and snow, moderate or heavy
|
|
169
|
Reserved
|
|
170
|
SNOW
|
|
171
|
Snow, slight
|
|
172
|
Snow, moderate
|
|
173
|
Snow, heavy
|
|
174
|
Ice pellets, slight
|
|
175
|
Ice pellets, moderate
|
|
176
|
Ice pellets, heavy
|
|
177
|
Snow grains
|
|
178
|
Ice crystals
|
|
179
|
Reserved
|
|
180
|
SHOWER(S) OR INTERMITTENT PRECIPITATION
|
|
181
|
Rain shower(s) or intermittent rain, slight
|
|
182
|
Rain shower(s) or intermittent rain, moderate
|
|
183
|
Rain shower(s) or intermittent rain, heavy
|
|
184
|
Rain shower(s) or intermittent rain, violent
|
|
185
|
Snow shower(s) or intermittent snow, slight
|
|
186
|
Snow shower(s) or intermittent snow, moderate
|
|
187
|
Snow shower(s) or intermittent snow, heavy
|
|
188
|
Reserved
|
|
189
|
Hail
|
|
190
|
THUNDERSTORM
|
|
191
|
Thunderstorm, slight or moderate, with no precipitation
|
|
192
|
Thunderstorm, slight or moderate, with rain showers and/or snow showers
|
|
193
|
Thunderstorm, slight or moderate, with hail
|
|
194
|
Thunderstorm, heavy, with no precipitation
|
|
195
|
Thunderstorm, heavy, with rain showers and/or snow showers
|
|
196
|
Thunderstorm, heavy, with hail
|
|
199
|
Tornado
|
|
204
|
Volcanic ash suspended in the air aloft
|
|
205
|
Not used
|
|
206
|
Thick dust haze, visibility less than 1 km
|
|
207
|
Blowing spray at the station
|
|
208
|
Drifting dust (sand)
|
|
209
|
Wall of dust or sand in distance (like haboob)
|
|
210
|
Snow haze
|
|
211
|
Whiteout
|
|
212
|
Not used
|
|
213
|
Lightning, cloud to surface
|
|
217
|
Dry thunderstorm
|
|
218
|
Not used
|
|
219
|
Tornado cloud (destructive) at or within sight of the station during preceding hour or at the time of observation
|
|
220
|
Deposition of volcanic ash
|
|
221
|
Deposition of dust or sand
|
|
222
|
Deposition of dew
|
|
223
|
Deposition of wet snow
|
|
224
|
Deposition of soft rime
|
|
225
|
Deposition of hard rime
|
|
226
|
Deposition of hoar frost
|
|
227
|
Deposition of glaze
|
|
228
|
Deposition of ice crust (ice slick)
|
|
229
|
Not used
|
|
230
|
Duststorm or sandstorm with temperature below 0 °C
|
|
239
|
Blowing snow, impossible to determine whether snow is falling or not
|
|
240
|
Not used
|
|
241
|
Fog on sea
|
|
242
|
Fog in valleys
|
|
243
|
Arctic or Antarctic sea smoke
|
|
244
|
Steam fog (sea, lake or river)
|
|
245
|
Steam log (land)
|
|
246
|
Fog over ice or snow cover
|
|
247
|
Dense fog, visibility 60-90 m
|
|
248
|
Dense fog, visibility 30-60 m
|
|
249
|
Dense fog, visibility less than 30 m
|
|
250
|
Drizzle, rate of fall - less than 0.10 mm h-1
|
|
251
|
Drizzle, rate of fall - 0.10-0.19 mm h-1
|
|
252
|
Drizzle, rate of fall - 0.20-0.39 mm h-1
|
|
253
|
Drizzle, rate of fall - 0.40-0.79 mm h-1
|
|
254
|
Drizzle, rate of fall - 0.80-1.59 mm h-1
|
|
255
|
Drizzle, rate of fall - 1.60-3.19 mm h-1
|
|
256
|
Drizzle, rate of fall - 3.20-6.39 mm h-1
|
|
257
|
Drizzle, rate of fall - 6.4 mm h-1 or more
|
|
258
|
Not used
|
|
259
|
Drizzle and snow
|
|
260
|
Rain, rate of fall - less than 1.0 mm h-1
|
|
261
|
Rain, rate of fall - 1.0-1.9 mm h-1
|
|
262
|
Rain, rate of fall - 2.0-3.9 mm h-1
|
|
263
|
Rain, rate of fall - 4.0-7.9 mm h-1
|
|
264
|
Rain, rate of fall - 8.0-15.9 mm h-1
|
|
265
|
Rain, rate of fall - 16.0-31.9 mm h-1
|
|
266
|
Rain, rate of fall - 32.0-63.9 mm h-1
|
|
267
|
Rain, rate of fall - 64.0 mm h-1 or more
|
|
270
|
Snow, rate of fall - less than 1.0 cm h-1
|
|
271
|
Snow, rate of fall - 1.0-1.9 cm h-1
|
|
272
|
Snow, rate of fall - 2.0-3.9 cm h-1
|
|
273
|
Snow, rate of fall - 4.0-7.9 cm h-1
|
|
274
|
Snow, rate of fall - 8.0-15.9 cm h-1
|
|
275
|
Snow, rate of fall - 16.0-31.9 cm h-1
|
|
276
|
Snow, rate of fall - 32.0-63.9 cm h-1
|
|
277
|
Snow, rate of fall - 64.0 cm h-1 or more
|
|
278
|
Snow or ice crystal precipitation from a clear sky
|
|
279
|
Wet snow, freezing on contact
|
|
280
|
Precipitation of rain
|
|
281
|
Precipitation of rain, freezing
|
|
282
|
Precipitation of rain and snow mixed
|
|
283
|
Precipitation of snow
|
|
284
|
Precipitation of snow pellets or small hall
|
|
285
|
Precipitation of snow pellets or small hail, with rain
|
|
286
|
Precipitation of snow pellets or small hail, with rain and snow mixed
|
|
287
|
Precipitation of snow pellets or small hail, with snow
|
|
288
|
Precipitation of hail
|
|
289
|
Precipitation of hail, with rain
|
|
290
|
Precipitation of hall, with rain and snow mixed
|
|
291
|
Precipitation of hail, with snow
|
|
292
|
Shower(s) or thunderstorm over sea
|
|
293
|
Shower(s) or thunderstorm over mountains
|
|
508
|
No significant phenomenon to report, present and past weather omitted
|
|
509
|
No observation, data not available, present and past weather omitted
|
|
510
|
Present and past weather missing, but expected
|
|
511
|
Missing value
|
|