Yong-Moon, The file you attached is one of FSL's MADIS-ACARS netcdf files. This file can be decoded using the dcacars decoder which will craete a gempak surface ship format file which can be used in NSHARP, or acprof (to create a sounding at a location from available soundings) or NMAP2, SFMAP to plot the observed values on a 2-d map. The command to decode your file is: cat 20050709_0800 | dcacars -v -l - YYYYMMDDHH_acars.gem Steve Chiswell Unidata User Support Ticket Details =================== Ticket ID: YHZ-593073 Department: Support GEMPAK Priority: Normal Status: Closed