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