Name	Notation	Description	Types	Status
High-resolution data sample	0		Concept	stable
Within 20 hPa of surface	1		Concept	stable
Pressure less than 10 hPa (i.e., 9, 8, 7, etc.) when no other reason applies	2		Concept	stable
Base pressure level for stability index	3		Concept	stable
Begin doubtful temperature, height data	4		Concept	stable
Begin missing data (all elements)	5		Concept	stable
Begin missing relative humidity data	6		Concept	stable
Begin missing temperature data	7		Concept	stable
Highest level reached before balloon descent because of icing or turbulence	8		Concept	stable
End doubtful temperature, height data	9		Concept	stable
End missing data (all elements)	10		Concept	stable
End missing relative humidity data	11		Concept	stable
End missing temperature data	12		Concept	stable
Zero degrees Celsius crossing(s) for RADAT	13		Concept	stable
Standard pressure level	14		Concept	stable
Operator-added level	15		Concept	stable
Operator-deleted level	16		Concept	stable
Balloon re-ascended beyond previous highest ascent level	17		Concept	stable
Significant relative humidity level	18		Concept	stable
Relative humidity level selection terminated	19		Concept	stable
Surface level	20		Concept	stable
Significant temperature level	21		Concept	stable
Mandatory temperature level	22		Concept	stable
Flight termination level	23		Concept	stable
Tropopause(s)	24		Concept	stable
Aircraft report	25		Concept	stable
Interpolated (generated) level	26		Concept	stable
Mandatory wind level	27		Concept	stable
Significant wind level	28		Concept	stable
Maximum wind level	29		Concept	stable
Incremental wind level (fixed regional)	30		Concept	stable
Incremental height level (generated)	31		Concept	stable
Wind termination level	32		Concept	stable
Pressure 100 to 110 hPa, when no other reason applies	33		Concept	stable
Freezing level base	34		Concept	stable
Freezing level top	35		Concept	stable
Flight level base	36		Concept	stable
Flight level top	37		Concept	stable
Significant thermodynamic level (inversion)	40		Concept	stable
Significant relative humidity level (according to NCDC criteria)	41		Concept	stable
Significant temperature level (according to NCDC)	42		Concept	stable
Begin missing wind data	43		Concept	stable
End missing wind data	44		Concept	stable
Level of 80-knot isotach above jet	60		Concept	stable
Level of 80-knot isotach below jet	61		Concept	stable
Other	62		Concept	stable
Missing value	63		Concept	stable