Hi Jon, > We've been able to convert the NARR data from grib to netCDF using your > decoder. Following the posts on Unidata's support site were very helpful! > > Our next challenge is to take the NARR netCDF files, each with one time > step's worth of data, and produce a new netCDF file with a week's worth of > data. Do you know of a program capable of doing this? Take a look at Charlie Zender's NCO package (netCDF Operators), specifically the concatenation operators: http://www.unidata.ucar.edu/packages/netcdf/software.html#NCO --Russ