Name	Notation	Description	Types	Status
Horizontal visibility	1		Concept	stable
Vertical visibility	2		Concept	stable
Present weather	3		Concept	stable
Past weather (1)	4		Concept	stable
Past weather (2)	5		Concept	stable
Flight rules	6		Concept	stable
Cloud distribution for aviation	8		Concept	stable
General weather indicator (TAF/METAR)	9		Concept	stable
Cloud cover (total)	10		Concept	stable
Cloud amount	11		Concept	stable
Cloud type	12		Concept	stable
Height of base of cloud	13		Concept	stable
Height of top of cloud	14		Concept	stable
Pressure at base of cloud	15		Concept	stable
Pressure at top of cloud	16		Concept	stable
Cloud top description	17		Concept	stable
Tendency of runway visual range	18		Concept	stable
Significant present or forecast weather	19		Concept	stable
Significant recent weather phenomena	20		Concept	stable
Type of precipitation	21		Concept	stable
Character of precipitation	22		Concept	stable
Other weather phenomena	23		Concept	stable
Intensity of phenomena	24		Concept	stable
Obscuration	25		Concept	stable
Character of obscuration	26		Concept	stable
Phenomena occurrence	27		Concept	stable
Expected change in intensity	28		Concept	stable
Rain flag	29		Concept	stable
Ice deposit (thickness)	31		Concept	stable
Rate of ice accretion (estimated)	32		Concept	stable
Cause of ice accretion	33		Concept	stable
Sea ice concentration	34		Concept	stable
Amount and type of ice	35		Concept	stable
Ice situation	36		Concept	stable
Ice development	37		Concept	stable
Bearing of ice edge	38		Concept	stable
Ice distance	39		Concept	stable
Evolution of drift snow	40		Concept	stable
Airframe icing	41		Concept	stable
Airframe icing present	42		Concept	stable
Peak liquid water content	43		Concept	stable
Average liquid water content	44		Concept	stable
Supercooled large droplet (SLD) conditions	45		Concept	stable
Evolution of feature	48		Concept	stable
Cloud index	50		Concept	stable
Amount of low clouds	51		Concept	stable
Amount of middle clouds	52		Concept	stable
Amount of high clouds	53		Concept	stable
True direction from which a phenomenon or clouds are moving or in which they are observed	54		Concept	stable
State of sky in the tropics	55		Concept	stable
Cloud phase	56		Concept	stable
Visibility seawards from a coastal station	58		Concept	stable
Minimum horizontal visibility	59		Concept	stable
Prevailing horizontal visibility	60		Concept	stable
Runway visual range (RVR)	61		Concept	stable
State of the ground (with or without snow)	62		Concept	stable
Special phenomena	63		Concept	stable
Snow cover	65		Concept	stable
Maximum diameter of hailstones	66		Concept	stable
Diameter of deposit	67		Concept	stable
Minimum number of atmospherics	70		Concept	stable
Accuracy of fix and rate of atmospherics	71		Concept	stable
Cloud amount in segment	81		Concept	stable
Amount segment cloud free	82		Concept	stable
Amount of segment covered by scene	83		Concept	stable
General condition of runway	85		Concept	stable
Runway deposits	86		Concept	stable
Runway contamination	87		Concept	stable
Depth of runway deposits	88		Concept	stable
Runway friction coefficient	89		Concept	stable
Special clouds	90		Concept	stable
Vertical visibility	91		Concept	stable
Height of base of cloud	92		Concept	stable
Height of inversion	93		Concept	stable
Ice probability	95		Concept	stable
Ice age (``A`` parameter)	96		Concept	stable
Locust (acridian) name	101		Concept	stable
Locust (maturity) colour	102		Concept	stable
Stage of development of locusts	103		Concept	stable
Organization state of swarm or band of locusts	104		Concept	stable
Size of swarm or band of locusts and duration of passage of swarm	105		Concept	stable
Locust population density	106		Concept	stable
Direction of movements of locust swarm	107		Concept	stable
Extent of vegetation	108		Concept	stable
x-axis error ellipse major component	111		Concept	stable
y-axis error ellipse minor component	112		Concept	stable
z-axis error ellipse component	113		Concept	stable
Angle of x-axis in error ellipse	114		Concept	stable
Angle of z-axis in error ellipse	115		Concept	stable
Emission height of cloud stroke	116		Concept	stable
Amplitude of lightning strike	117		Concept	stable
Lightning detection error	118		Concept	stable
Lightning discharge polarity	119		Concept	stable
Threshold value for polarity decision	121		Concept	stable
Threshold value for polarity decision	122		Concept	stable
Minimum threshold for detection	123		Concept	stable
Lightning stroke or flash	124		Concept	stable
Lightning rate of discharge	126		Concept	stable
Lightning - distance from station	127		Concept	stable
Lightning - direction from station	128		Concept	stable
Cloud hydrometeor concentration	130		Concept	stable
Effective radius of cloud hydrometeors	131		Concept	stable
Cloud liquid water content	132		Concept	stable
Hydrometeor radius	133		Concept	stable
Ice mass (on a rod)	135		Concept	stable
Supplementary cloud type	136		Concept	stable
Evolution of clouds	137		Concept	stable