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 The model will fail unless the environment variable:

export GRIB_GRIBEX_MODE_ON=1

is set in the job script. This is because the shallow-water code uses a different set of subroutines for output and does not go through the usual code path for 3D forecasts (if NCONF=1) and uses a older code to output.

Otherwise the model will crash at the first output attempt. Users will usually see a failure from the grib_api library (typically grib_set_real8_array).