Notation	Name	Description	Status
0	Isolated cumulus humilis and/or cumulus mediocris of vertical development		stable
1	Numerous cumulus humilis and/or cumulus mediocris of vertical development		stable
2	Isolated cumulus congestus of vertical development		stable
3	Numerous cumulus congestus of vertical development		stable
4	Isolated cumulonimbus of vertical development		stable
5	Numerous cumulonimbus of vertical development		stable
6	Isolated cumulus and cumulonimbus of vertical development		stable
7	Numerous cumulus and cumulonimbus of vertical development		stable
11	Isolated orographic clouds, pileus, incus, forming		stable
12	Isolated orographic clouds, pileus, incus, not changing		stable
13	Isolated orographic clouds, pileus, incus, dissolving		stable
14	Irregular banks of orographic cloud, föhn bank, etc., forming		stable
15	Irregular banks of orographic cloud, föhn bank, etc., not changing		stable
16	Irregular banks of orographic cloud, föhn bank, etc., dissolving		stable
17	Compact layer of orographic cloud, föhn bank, etc., forming		stable
18	Compact layer of orographic cloud, föhn bank, etc., not changing		stable
19	Compact layer of orographic cloud, föhn bank, etc., dissolving		stable
20	All mountains open, only small amounts of cloud present		stable
21	Mountains partly covered with detached clouds (not more than half the peaks can be seen)		stable
22	All mountain slopes covered, peaks and passes free		stable
23	Mountains open on observer’s side (only small amounts of cloud present), but a continuous wall of cloud on the other side		stable
24	Clouds low above the mountains, but all slopes and mountains open (only small amounts of cloud on the slopes)		stable
25	Clouds low above the mountains, peaks partly covered by precipitation trails or clouds		stable
26	All peaks covered but passes open, slopes either open or covered		stable
27	Mountains generally covered but some peaks free, slopes wholly or partially covered		stable
28	All peaks, passes and slopes covered		stable
29	Mountains cannot be seen owing to darkness, fog, snowstorm, precipitation, etc.		stable
35	Non-persistent condensation trails		stable
36	Persistent condensation trails covering less than 1/8 of the sky		stable
37	Persistent condensation trails covering 1/8 of the sky		stable
38	Persistent condensation trails covering 2/8 of the sky		stable
39	Persistent condensation trails covering 3/8 or more of the sky		stable
40	No cloud or mist observed from a higher level		stable
41	Mist, clear above observed from a higher level		stable
42	Fog patches observed from a higher level		stable
43	Layer of slight fog observed from a higher level		stable
44	Layer of thick fog observed from a higher level		stable
45	Some isolated clouds observed from a higher level		stable
46	Isolated clouds and fog below observed from a higher level		stable
47	Many isolated clouds observed from a higher level		stable
48	Sea of clouds observed from a higher level		stable
49	Bad visibility obscuring the downward view observed from a higher level		stable
511	Missing value		stable