10 0 NESTED GRID MODEL (NGM)
21 1 AVIATION MODEL (AVN)
32 2 MEDIUM RANGE FORECAST (MRF) MODEL
43 3 GLOBAL DATA ASSIMILATION SYSTEM (GDAS) FORECAST MODEL
54 4 PRIOR SOUNDINGS (WITHIN 3 HOURS OF CURRENT TIME)
65 5 CLIMATOLOGY
715 15 MISSING VALUE
8