1 -> SURFACE
2 -> STANDARD LEVEL
3 -> TROPOPAUSE LEVEL
4 -> MAXIMUM WIND LEVEL
5 -> SIGNIFICANT TEMPERATURE LEVEL
6 -> SIGNIFICANT HUMIDITY LEVEL
7 -> SIGNIFICANT WIND LEVEL
8 -> BEGINNING OF MISSING TEMPERATURE DATA
9 -> END OF MISSING TEMPERATURE DATA
10 -> BEGINNING OF MISSING HUMIDITY DATA
11 -> END OF MISSING HUMIDITY DATA
12 -> BEGINNING OF MISSING WIND DATA
13 -> END OF MISSING WIND DATA