Notation	Name	Description	Status
1	Highest wind speed gusts greater than 11.5 m/s		stable
2	Highest mean wind speed greater than 17.5 m/s		stable
7	Visibility greater than 100 000 m		stable
10	Mirage - No specification		stable
11	Mirage - Image of distant object raised (looming)		stable
12	Mirage - Image of distant object raised clear above the horizon		stable
13	Mirage - Inverted image of distant object		stable
14	Mirage - Complex, multiple images of distant object (images not inverted)		stable
15	Mirage - Complex, multiple images of distant object (some images being inverted)		stable
16	Mirage - Sun or moon seen appreciably distorted		stable
17	Mirage - Sun visible, although astronomically below the horizon		stable
18	Mirage - Moon visible, although astronomically below the horizon		stable
20	Day darkness, bad, worst in direction specified		stable
21	Day darkness, very bad, worst in direction specified		stable
22	Day darkness, black, worst in direction specified		stable
31	Slight coloration of clouds at sunrise associated with a tropical disturbance		stable
32	Deep-red coloration of clouds at sunrise associated with a tropical disturbance		stable
33	Slight coloration of clouds at sunset associated with a tropical disturbance		stable
34	Deep-red coloration of clouds at sunset associated with a tropical disturbance		stable
35	Convergence of CH clouds at a point below 45° forming or increasing and associated with a tropical disturbance		stable
36	Convergence of CH clouds at a point above 45° associated with a tropical disturbance		stable
37	Convergence of CH clouds at a point below 45° dissolving or diminishing and associated with a tropical disturbance		stable
38	Convergence of CH clouds at a point above 45° associated with a tropical disturbance		stable
40	Hoar frost on horizontal surfaces		stable
41	Hoar frost on horizontal and vertical surfaces		stable
42	Precipitation containing sand or desert dust		stable
43	Precipitation containing volcanic ash		stable
50	Calm or light wind followed by a squall		stable
51	Calm or light wind followed by a succession of squalls		stable
52	Gusty weather followed by a squall		stable
53	Gusty weather followed by a succession of squalls		stable
54	Squall followed by gusty weather		stable
55	General gusty weather with squall at intervals		stable
56	Squall approaching station		stable
57	Line squall		stable
58	Squall with drifting or blowing dust or sand		stable
59	Line squall with drifting or blowing dust or sand		stable
60	Temperature steady		stable
61	Temperature falling, without going below 0°C		stable
62	Temperature rising, without going above 0°C		stable
63	Temperature falling to a value below 0°C		stable
64	Temperature rising to a value above 0°C		stable
65	Irregular variation, oscillations of temperature passing through 0°C		stable
66	Irregular variation, oscillations of temperature not passing through 0°C		stable
67	Variation of temperature not observed		stable
68	Not allocated		stable
69	Variation of temperature unknown owing to lack of thermograph		stable
70	Visibility has not varied (sun* visible) towards direction specified		stable
71	Visibility has not varied (sun* invisible) towards direction specified		stable
72	Visibility has increased (sun* visible) towards direction specified		stable
73	Visibility has increased (sun* invisible) towards direction specified		stable
74	Visibility has decreased (sun* visible) towards direction specified		stable
75	Visibility has decreased (sun* invisible) towards direction specified		stable
76	Fog coming from direction specified		stable
77	Fog has lifted, without dissipating		stable
78	Fog has dispersed without regard to direction		stable
79	Moving patches or banks of fog		stable
80	Brocken spectre		stable
81	Rainbow		stable
82	Solar or lunar halo		stable
83	Parhelia or anthelia		stable
84	Sun pillar		stable
85	Corona		stable
86	Twilight glow		stable
87	Twilight glow on the mountains (Alpenglühen)		stable
88	Mirage		stable
89	Zodiacal light		stable
90	St Elmo's fire		stable
1023	Missing value		stable