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Using this data in WRF, however, is tricky.
You can make your own Vtables, based on the GRIB codes and variable names from Vtable.ECMWF ( which is for GRIB1), but you need to add 4 columns to the right (GRIB2, for example look at Vtable.GFS).
You also need to split the ARPEGE GRIB2 files, which contain multiple forecast times (arranged by variable), into time-specific files, so ungrib can read them. This can be done by installing and using wgrib2.
ARPEGE file IP1 has the variables GEOPT, T, U, V, RH; file SP1 - Sea level pressure, U10m , V10m, T2m, RH2m; file SP2 - Surface pressure, SKINTEMP, but soil variables
seem to be missing completely.
So far I succeeded in making 3 Vtables and running ungrib, but metgrid complains about the missing soil data and stops.