Jennie, You can download the GDAS pressure level grib files from: ftp://ftpprd.ncep.noaa.gov/pub/data/nccf/com/gfs/prod/gdas.yyyymmdd/ The grib files are gdas1.tCCz.pgrbfhh (roughly 22MB in size). Steve Chiswell Unidata User Support Ticket Details =================== Ticket ID: LCY-696429 Department: Support GEMPAK Priority: Normal Status: Closed