AH              13   N   absolute humidity
CBH             35   N   cloud base height
CBT             20   N   infrared cloud base temperature
CLD             19   N   cloud liquid density
DPD             10   N   dewpoint depression                  
HT              11   N   geometric height                     
ILW             21   N   integrated liquid water
P               12   N   pressure                             
PWV             22   N   integrated water vapor
Q                9   N   specific humidity                    
RH               8   N   relative humidity                    
STALOC          29   C   station location
STATYPE         23   N   station type
T                5   N   air temperature                      
TD               7   N   dewpoint temperature                 
TV               6   N   virtual temperature                  
WVMR            34   N   water vapor mixing ratio
