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Hi James, We don't have any software that reads GRIB files and manipulates their data to create new GRIB files, but we do have software that decodes GRIB files or reads them through a netCDF interface, in our netCDF Java package. However, you may find one of the following packages more suitable for what you want to do: CDO: http://www.mpimet.mpg.de/fileadmin/software/cdo/ Gfdnavi: http://www.gfd-dennou.org/arch/davis/gfdnavi/index.en.htm GrADS: http://grads.iges.org/grads/grads.html NCL: http://www.ncl.ucar.edu/ --Russ Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: MWT-709934 Department: Support netCDF Priority: Normal Status: Closed