Table D2

Instructions for the proper application of level designator.

1. The designator specified in this table should be used to the greatest extent possible to indicate the level of the data contained within the text of the bulletin.

2. When data at more than one level are contained in the text, the designator for only one of the levels should be used.

3. When the table does not contain a suitable designator for the level, a designator which is not assigned in the table should be used.

Designator	Level
99	1000 hPa
98	Air properties for the earth's surface
97	Level of the tropopause
96	Level of maximum wind
95	950 hPa
94	Level of 0oC isotherm
93	Not assigned - 975 hPa (U.S.use)
92	925 hPa
91	Not assigned - 875 hPa (U.S.use)
90	900 hPa
89	Any parameter reduced/sea level (MSLP)
88	Ground/water properties for the earth's surface (i.e. snow cover, wave & swell)
87	1000-500 hPa thickness
86	Boundary Layer
85-01	Hundreds and tens digits of the hectopascal level (e.g. 70 = 700 hPa;03 = 030 hPa)       To include:       81 = 810 hPa = 6000ft FL       82 = 825 hPa (U.S.use)       77 = 775 hPa (U.S.use)       73 = 730 hPa = 9000ft FL       72 = 725 hPa(U.S.use)       67 = 675 hPa(U.S.use)       65 = 650 hPa = 12000ft FL       62 = 625 hPa(U.S.use)
00	Entire Atmosphere (e.g. precipitable water)
Note: The 810, 730, and 650 hPa levels are not being used as pressure levels, they are being used as geometric heights.