Name	Notation	Description	Types	Status
Quasi-stationary front at the surface	0		Concept	stable
Quasi-stationary front above the surface	1		Concept	stable
Warm front at the surface	2		Concept	stable
Warm front above the surface	3		Concept	stable
Cold front at the surface	4		Concept	stable
Cold front above the surface	5		Concept	stable
Occlusion	6		Concept	stable
Instability line	7		Concept	stable
Intertropical front	8		Concept	stable
Convergence line	9		Concept	stable
Jet stream	10		Concept	stable
Cloud clear	11		Concept	stable
Cloud	12		Concept	stable
Turbulence	13		Concept	stable
Storm	14		Concept	stable
Airframe icing	15		Concept	stable
Phenomenon	16		Concept	stable
Volcano	17		Concept	stable
Atmospherics	18		Concept	stable
Special clouds	20		Concept	stable
Thunderstorm	21		Concept	stable
Tropical cyclone	22		Concept	stable
Mountain wave	23		Concept	stable
Duststorm	24		Concept	stable
Sandstorm	25		Concept	stable
Missing value	63		Concept	stable