Cloud development not observed or not observable
|
0 |
|
Concept
|
stable
|
Clouds generally dissolving or becoming less developed
|
1 |
|
Concept
|
stable
|
State of sky on the whole unchanged
|
2 |
|
Concept
|
stable
|
Clouds generally forming or developing
|
3 |
|
Concept
|
stable
|
Visibility reduced by smoke, e.g. veldt or forest fires, industrial smoke or volcanic ashes
|
4 |
|
Concept
|
stable
|
Haze
|
5 |
|
Concept
|
stable
|
Widespread dust in suspension in the air, not raised by wind at or near the station at the time of observation
|
6 |
|
Concept
|
stable
|
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
|
7 |
|
Concept
|
stable
|
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
|
8 |
|
Concept
|
stable
|
Duststorm or sandstorm within sight at the time of observation, or at the station during the preceding hour
|
9 |
|
Concept
|
stable
|
Mist
|
10 |
|
Concept
|
stable
|
Patches
|
11 |
|
Concept
|
stable
|
More or less continuous
|
12 |
|
Concept
|
stable
|
Lightning visible, no thunder heard
|
13 |
|
Concept
|
stable
|
Precipitation within sight, not reaching the ground or the surface of the sea
|
14 |
|
Concept
|
stable
|
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
|
15 |
|
Concept
|
stable
|
Precipitation within sight, reaching the ground or the surface of the sea, near to, but not at the station
|
16 |
|
Concept
|
stable
|
Thunderstorm, but no precipitation at the time of observation
|
17 |
|
Concept
|
stable
|
Squalls
|
18 |
|
Concept
|
stable
|
Funnel cloud(s)
|
19 |
|
Concept
|
stable
|
Drizzle (not freezing) or snow grains
|
20 |
|
Concept
|
stable
|
Rain (not freezing)
|
21 |
|
Concept
|
stable
|
Snow
|
22 |
|
Concept
|
stable
|
Rain and snow or ice pellets
|
23 |
|
Concept
|
stable
|
Freezing drizzle or freezing rain
|
24 |
|
Concept
|
stable
|
Shower(s) of rain
|
25 |
|
Concept
|
stable
|
Shower(s) of snow, or of rain and snow
|
26 |
|
Concept
|
stable
|
Shower(s) of hail*, or of rain and hail*
|
27 |
|
Concept
|
stable
|
Fog or ice fog
|
28 |
|
Concept
|
stable
|
Thunderstorm (with or without precipitation)
|
29 |
|
Concept
|
stable
|
Slight or moderate duststorm or sandstorm
|
30 |
|
Concept
|
stable
|
Slight or moderate duststorm or sandstorm
|
31 |
|
Concept
|
stable
|
Slight or moderate duststorm or sandstorm
|
32 |
|
Concept
|
stable
|
Severe duststorm or sandstorm
|
33 |
|
Concept
|
stable
|
Severe duststorm or sandstorm
|
34 |
|
Concept
|
stable
|
Severe duststorm or sandstorm
|
35 |
|
Concept
|
stable
|
Slight or moderate drifting snow
|
36 |
|
Concept
|
stable
|
Heavy drifting snow
|
37 |
|
Concept
|
stable
|
Slight or moderate blowing snow
|
38 |
|
Concept
|
stable
|
Heavy blowing snow
|
39 |
|
Concept
|
stable
|
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
|
40 |
|
Concept
|
stable
|
Fog or ice fog in patches
|
41 |
|
Concept
|
stable
|
Fog or ice fog, sky visible
|
42 |
|
Concept
|
stable
|
Fog or ice fog, sky invisible
|
43 |
|
Concept
|
stable
|
Fog or ice fog, sky visible
|
44 |
|
Concept
|
stable
|
Fog or ice fog, sky invisible
|
45 |
|
Concept
|
stable
|
Fog or ice fog, sky visible
|
46 |
|
Concept
|
stable
|
Fog or ice fog, sky invisible
|
47 |
|
Concept
|
stable
|
Fog, depositing rime, sky visible
|
48 |
|
Concept
|
stable
|
Fog, depositing rime, sky invisible
|
49 |
|
Concept
|
stable
|
Drizzle, not freezing, intermittent
|
50 |
|
Concept
|
stable
|
Drizzle, not freezing, continuous
|
51 |
|
Concept
|
stable
|
Drizzle, not freezing, intermittent
|
52 |
|
Concept
|
stable
|
Drizzle, not freezing, continuous
|
53 |
|
Concept
|
stable
|
Drizzle, not freezing, intermittent
|
54 |
|
Concept
|
stable
|
Drizzle, not freezing, continuous
|
55 |
|
Concept
|
stable
|
Drizzle, freezing, slight
|
56 |
|
Concept
|
stable
|
Drizzle, freezing, moderate or heavy (dense)
|
57 |
|
Concept
|
stable
|
Drizzle and rain, slight
|
58 |
|
Concept
|
stable
|
Drizzle and rain, moderate or heavy
|
59 |
|
Concept
|
stable
|
Rain, not freezing, intermittent
|
60 |
|
Concept
|
stable
|
Rain, not freezing, continuous
|
61 |
|
Concept
|
stable
|
Rain, not freezing, intermittent
|
62 |
|
Concept
|
stable
|
Rain, not freezing, continuous
|
63 |
|
Concept
|
stable
|
Rain, not freezing, intermittent
|
64 |
|
Concept
|
stable
|
Rain, not freezing, continuous
|
65 |
|
Concept
|
stable
|
Rain, freezing, slight
|
66 |
|
Concept
|
stable
|
Rain, freezing, moderate or heavy
|
67 |
|
Concept
|
stable
|
Rain or drizzle and snow, slight
|
68 |
|
Concept
|
stable
|
Rain or drizzle and snow, moderate or heavy
|
69 |
|
Concept
|
stable
|
Intermittent fall of snowflakes
|
70 |
|
Concept
|
stable
|
Continuous fall of snowflakes
|
71 |
|
Concept
|
stable
|
Intermittent fall of snowflakes
|
72 |
|
Concept
|
stable
|
Continuous fall of snowflakes
|
73 |
|
Concept
|
stable
|
Intermittent fall of snowflakes
|
74 |
|
Concept
|
stable
|
Continuous fall of snowflakes
|
75 |
|
Concept
|
stable
|
Diamond dust (with or without fog)
|
76 |
|
Concept
|
stable
|
Snow grains (with or without fog)
|
77 |
|
Concept
|
stable
|
Isolated star-like snow crystals (with or without fog)
|
78 |
|
Concept
|
stable
|
Ice pellets
|
79 |
|
Concept
|
stable
|
Rain shower(s), slight
|
80 |
|
Concept
|
stable
|
Rain shower(s), moderate or heavy
|
81 |
|
Concept
|
stable
|
Rain shower(s), violent
|
82 |
|
Concept
|
stable
|
Shower(s) of rain and snow mixed, slight
|
83 |
|
Concept
|
stable
|
Shower(s) of rain and snow mixed, moderate or heavy
|
84 |
|
Concept
|
stable
|
Snow shower(s), slight
|
85 |
|
Concept
|
stable
|
Snow shower(s), moderate or heavy
|
86 |
|
Concept
|
stable
|
Shower(s) of snow pellets or small hail, with or without rain or rain and snow mixed
|
87 |
|
Concept
|
stable
|
Shower(s) of snow pellets or small hail, with or without rain or rain and snow mixed
|
88 |
|
Concept
|
stable
|
Shower(s) of hail, with or without rain or rain and snow mixed, not associated with thunder
|
89 |
|
Concept
|
stable
|
Shower(s) of hail, with or without rain or rain and snow mixed, not associated with thunder
|
90 |
|
Concept
|
stable
|
Slight rain at time of observation
|
91 |
|
Concept
|
stable
|
Moderate or heavy rain at time of observation
|
92 |
|
Concept
|
stable
|
Slight snow, or rain and snow mixed or hail* at time of observation
|
93 |
|
Concept
|
stable
|
Moderate or heavy snow, or rain and snow mixed or hail* at time of observation
|
94 |
|
Concept
|
stable
|
Thunderstorm, slight or moderate, without hail*, but with rain and/or snow at time of observation
|
95 |
|
Concept
|
stable
|
Thunderstorm, slight or moderate, with hail* at time of observation
|
96 |
|
Concept
|
stable
|
Thunderstorm, heavy, without hail*, but with rain and/or snow at time of observation
|
97 |
|
Concept
|
stable
|
Thunderstorm combined with duststorm or sandstorm at time of observation
|
98 |
|
Concept
|
stable
|
Thunderstorm, heavy, with hail* at time of observation
|
99 |
|
Concept
|
stable
|
No significant weather observed
|
100 |
|
Concept
|
stable
|
Clouds generally dissolving or becoming less developed during the past hour
|
101 |
|
Concept
|
stable
|
State of sky on the whole unchanged during the past hour
|
102 |
|
Concept
|
stable
|
Clouds generally forming or developing during the past hour
|
103 |
|
Concept
|
stable
|
Haze or smoke, or dust in suspension in the air, visibility equal to, or greater than, 1 km
|
104 |
|
Concept
|
stable
|
Haze or smoke, or dust in suspension in the air, visibility less than 1 km
|
105 |
|
Concept
|
stable
|
Mist
|
110 |
|
Concept
|
stable
|
Diamond dust
|
111 |
|
Concept
|
stable
|
Distant lightning
|
112 |
|
Concept
|
stable
|
Squalls
|
118 |
|
Concept
|
stable
|
Fog
|
120 |
|
Concept
|
stable
|
PRECIPITATION
|
121 |
|
Concept
|
stable
|
Drizzle (not freezing) or snow grains
|
122 |
|
Concept
|
stable
|
Rain (not freezing)
|
123 |
|
Concept
|
stable
|
Snow
|
124 |
|
Concept
|
stable
|
Freezing drizzle or freezing rain
|
125 |
|
Concept
|
stable
|
Thunderstorm (with or without precipitation)
|
126 |
|
Concept
|
stable
|
BLOWING OR DRIFTING SNOW OR SAND
|
127 |
|
Concept
|
stable
|
Blowing or drifting snow or sand, visibility equal to, or greater than, 1 km
|
128 |
|
Concept
|
stable
|
Blowing or drifting snow or sand, visibility less than 1 km
|
129 |
|
Concept
|
stable
|
FOG
|
130 |
|
Concept
|
stable
|
Fog or ice fog in patches
|
131 |
|
Concept
|
stable
|
Fog or ice fog, has become thinner during the past hour
|
132 |
|
Concept
|
stable
|
Fog or ice fog, no appreciable change during the past hour
|
133 |
|
Concept
|
stable
|
Fog or ice fog, has begun or become thicker during the past hour
|
134 |
|
Concept
|
stable
|
Fog, depositing rime
|
135 |
|
Concept
|
stable
|
PRECIPITATION
|
140 |
|
Concept
|
stable
|
Precipitation, slight or moderate
|
141 |
|
Concept
|
stable
|
Precipitation, heavy
|
142 |
|
Concept
|
stable
|
Liquid precipitation, slight or moderate
|
143 |
|
Concept
|
stable
|
Liquid precipitation, heavy
|
144 |
|
Concept
|
stable
|
Solid precipitation, slight or moderate
|
145 |
|
Concept
|
stable
|
Solid precipitation, heavy
|
146 |
|
Concept
|
stable
|
Freezing precipitation, slight or moderate
|
147 |
|
Concept
|
stable
|
Freezing precipitation, heavy
|
148 |
|
Concept
|
stable
|
DRIZZLE
|
150 |
|
Concept
|
stable
|
Drizzle, not freezing, slight
|
151 |
|
Concept
|
stable
|
Drizzle, not freezing, moderate
|
152 |
|
Concept
|
stable
|
Drizzle, not freezing, heavy
|
153 |
|
Concept
|
stable
|
Drizzle, freezing, slight
|
154 |
|
Concept
|
stable
|
Drizzle, freezing, moderate
|
155 |
|
Concept
|
stable
|
Drizzle, freezing, heavy
|
156 |
|
Concept
|
stable
|
Drizzle and rain, slight
|
157 |
|
Concept
|
stable
|
Drizzle and rain, moderate or heavy
|
158 |
|
Concept
|
stable
|
RAIN
|
160 |
|
Concept
|
stable
|
Rain, not freezing, slight
|
161 |
|
Concept
|
stable
|
Rain, not freezing, moderate
|
162 |
|
Concept
|
stable
|
Rain, not freezing, heavy
|
163 |
|
Concept
|
stable
|
Rain, freezing, slight
|
164 |
|
Concept
|
stable
|
Rain, freezing, moderate
|
165 |
|
Concept
|
stable
|
Rain, freezing, heavy
|
166 |
|
Concept
|
stable
|
Rain (or drizzle) and snow, slight
|
167 |
|
Concept
|
stable
|
Rain (or drizzle) and snow, moderate or heavy
|
168 |
|
Concept
|
stable
|
SNOW
|
170 |
|
Concept
|
stable
|
Snow, slight
|
171 |
|
Concept
|
stable
|
Snow, moderate
|
172 |
|
Concept
|
stable
|
Snow, heavy
|
173 |
|
Concept
|
stable
|
Ice pellets, slight
|
174 |
|
Concept
|
stable
|
Ice pellets, moderate
|
175 |
|
Concept
|
stable
|
Ice pellets, heavy
|
176 |
|
Concept
|
stable
|
Snow grains
|
177 |
|
Concept
|
stable
|
Ice crystals
|
178 |
|
Concept
|
stable
|
SHOWER(S) OR INTERMITTENT PRECIPITATION
|
180 |
|
Concept
|
stable
|
Rain shower(s) or intermittent rain, slight
|
181 |
|
Concept
|
stable
|
Rain shower(s) or intermittent rain, moderate
|
182 |
|
Concept
|
stable
|
Rain shower(s) or intermittent rain, heavy
|
183 |
|
Concept
|
stable
|
Rain shower(s) or intermittent rain, violent
|
184 |
|
Concept
|
stable
|
Snow shower(s) or intermittent snow, slight
|
185 |
|
Concept
|
stable
|
Snow shower(s) or intermittent snow, moderate
|
186 |
|
Concept
|
stable
|
Snow shower(s) or intermittent snow, heavy
|
187 |
|
Concept
|
stable
|
Hail
|
189 |
|
Concept
|
stable
|
THUNDERSTORM
|
190 |
|
Concept
|
stable
|
Thunderstorm, slight or moderate, with no precipitation
|
191 |
|
Concept
|
stable
|
Thunderstorm, slight or moderate, with rain showers and/or snow showers
|
192 |
|
Concept
|
stable
|
Thunderstorm, slight or moderate, with hail
|
193 |
|
Concept
|
stable
|
Thunderstorm, heavy, with no precipitation
|
194 |
|
Concept
|
stable
|
Thunderstorm, heavy, with rain showers and/or snow showers
|
195 |
|
Concept
|
stable
|
Thunderstorm, heavy, with hail
|
196 |
|
Concept
|
stable
|
Tornado
|
199 |
|
Concept
|
stable
|
Volcanic ash suspended in the air aloft
|
204 |
|
Concept
|
stable
|
Not used
|
205 |
|
Concept
|
stable
|
Thick dust haze, visibility less than 1 km
|
206 |
|
Concept
|
stable
|
Blowing spray at the station
|
207 |
|
Concept
|
stable
|
Drifting dust (sand)
|
208 |
|
Concept
|
stable
|
Wall of dust or sand in distance (like haboob)
|
209 |
|
Concept
|
stable
|
Snow haze
|
210 |
|
Concept
|
stable
|
Whiteout
|
211 |
|
Concept
|
stable
|
Not used
|
212 |
|
Concept
|
stable
|
Lightning, cloud to surface
|
213 |
|
Concept
|
stable
|
Dry thunderstorm
|
217 |
|
Concept
|
stable
|
Not used
|
218 |
|
Concept
|
stable
|
Tornado cloud (destructive) at or within sight of the station during preceding hour or at the time of observation
|
219 |
|
Concept
|
stable
|
Deposition of volcanic ash
|
220 |
|
Concept
|
stable
|
Deposition of dust or sand
|
221 |
|
Concept
|
stable
|
Deposition of dew
|
222 |
|
Concept
|
stable
|
Deposition of wet snow
|
223 |
|
Concept
|
stable
|
Deposition of soft rime
|
224 |
|
Concept
|
stable
|
Deposition of hard rime
|
225 |
|
Concept
|
stable
|
Deposition of hoar frost
|
226 |
|
Concept
|
stable
|
Deposition of glaze
|
227 |
|
Concept
|
stable
|
Deposition of ice crust (ice slick)
|
228 |
|
Concept
|
stable
|
Not used
|
229 |
|
Concept
|
stable
|
Duststorm or sandstorm with temperature below 0 °C
|
230 |
|
Concept
|
stable
|
Blowing snow, impossible to determine whether snow is falling or not
|
239 |
|
Concept
|
stable
|
Not used
|
240 |
|
Concept
|
stable
|
Fog on sea
|
241 |
|
Concept
|
stable
|
Fog in valleys
|
242 |
|
Concept
|
stable
|
Arctic or Antarctic sea smoke
|
243 |
|
Concept
|
stable
|
Steam fog (sea, lake or river)
|
244 |
|
Concept
|
stable
|
Steam log (land)
|
245 |
|
Concept
|
stable
|
Fog over ice or snow cover
|
246 |
|
Concept
|
stable
|
Dense fog, visibility 60-90 m
|
247 |
|
Concept
|
stable
|
Dense fog, visibility 30-60 m
|
248 |
|
Concept
|
stable
|
Dense fog, visibility less than 30 m
|
249 |
|
Concept
|
stable
|
Drizzle, rate of fall - less than 0.10 mm h-1
|
250 |
|
Concept
|
stable
|
Drizzle, rate of fall - 0.10-0.19 mm h-1
|
251 |
|
Concept
|
stable
|
Drizzle, rate of fall - 0.20-0.39 mm h-1
|
252 |
|
Concept
|
stable
|
Drizzle, rate of fall - 0.40-0.79 mm h-1
|
253 |
|
Concept
|
stable
|
Drizzle, rate of fall - 0.80-1.59 mm h-1
|
254 |
|
Concept
|
stable
|
Drizzle, rate of fall - 1.60-3.19 mm h-1
|
255 |
|
Concept
|
stable
|
Drizzle, rate of fall - 3.20-6.39 mm h-1
|
256 |
|
Concept
|
stable
|
Drizzle, rate of fall - 6.4 mm h-1 or more
|
257 |
|
Concept
|
stable
|
Not used
|
258 |
|
Concept
|
stable
|
Drizzle and snow
|
259 |
|
Concept
|
stable
|
Rain, rate of fall - less than 1.0 mm h-1
|
260 |
|
Concept
|
stable
|
Rain, rate of fall - 1.0-1.9 mm h-1
|
261 |
|
Concept
|
stable
|
Rain, rate of fall - 2.0-3.9 mm h-1
|
262 |
|
Concept
|
stable
|
Rain, rate of fall - 4.0-7.9 mm h-1
|
263 |
|
Concept
|
stable
|
Rain, rate of fall - 8.0-15.9 mm h-1
|
264 |
|
Concept
|
stable
|
Rain, rate of fall - 16.0-31.9 mm h-1
|
265 |
|
Concept
|
stable
|
Rain, rate of fall - 32.0-63.9 mm h-1
|
266 |
|
Concept
|
stable
|
Rain, rate of fall - 64.0 mm h-1 or more
|
267 |
|
Concept
|
stable
|
Snow, rate of fall - less than 1.0 cm h-1
|
270 |
|
Concept
|
stable
|
Snow, rate of fall - 1.0-1.9 cm h-1
|
271 |
|
Concept
|
stable
|
Snow, rate of fall - 2.0-3.9 cm h-1
|
272 |
|
Concept
|
stable
|
Snow, rate of fall - 4.0-7.9 cm h-1
|
273 |
|
Concept
|
stable
|
Snow, rate of fall - 8.0-15.9 cm h-1
|
274 |
|
Concept
|
stable
|
Snow, rate of fall - 16.0-31.9 cm h-1
|
275 |
|
Concept
|
stable
|
Snow, rate of fall - 32.0-63.9 cm h-1
|
276 |
|
Concept
|
stable
|
Snow, rate of fall - 64.0 cm h-1 or more
|
277 |
|
Concept
|
stable
|
Snow or ice crystal precipitation from a clear sky
|
278 |
|
Concept
|
stable
|
Wet snow, freezing on contact
|
279 |
|
Concept
|
stable
|
Precipitation of rain
|
280 |
|
Concept
|
stable
|
Precipitation of rain, freezing
|
281 |
|
Concept
|
stable
|
Precipitation of rain and snow mixed
|
282 |
|
Concept
|
stable
|
Precipitation of snow
|
283 |
|
Concept
|
stable
|
Precipitation of snow pellets or small hall
|
284 |
|
Concept
|
stable
|
Precipitation of snow pellets or small hail, with rain
|
285 |
|
Concept
|
stable
|
Precipitation of snow pellets or small hail, with rain and snow mixed
|
286 |
|
Concept
|
stable
|
Precipitation of snow pellets or small hail, with snow
|
287 |
|
Concept
|
stable
|
Precipitation of hail
|
288 |
|
Concept
|
stable
|
Precipitation of hail, with rain
|
289 |
|
Concept
|
stable
|
Precipitation of hall, with rain and snow mixed
|
290 |
|
Concept
|
stable
|
Precipitation of hail, with snow
|
291 |
|
Concept
|
stable
|
Shower(s) or thunderstorm over sea
|
292 |
|
Concept
|
stable
|
Shower(s) or thunderstorm over mountains
|
293 |
|
Concept
|
stable
|
No significant phenomenon to report, present and past weather omitted
|
508 |
|
Concept
|
stable
|
No observation, data not available, present and past weather omitted
|
509 |
|
Concept
|
stable
|
Present and past weather missing, but expected
|
510 |
|
Concept
|
stable
|
Missing value
|
511 |
|
Concept
|
stable
|