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To be clear, these messages like "Classic mode NetCDf does not support unsigned integer types:" are coming from one of the python libraries, not from the netcdf-c library. So presumably they are coming from somewhere in the netcdf4 python module. If I am correct, then I am not sure if either Ward or I can solve this problem. You may need to contact the developer (Jeff Whitaker?) of the netcdf4 python module. You might try re-posting your problem here: https://github.com/Unidata/netcdf4-python =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: GKE-356296 Department: Support netCDF Priority: Normal Status: Open =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.