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If you do not have access to the ECMWF hpc2020 file system, or if you wish to install the climatological input files in a local directory of your choice, then you can download the required data from this site: https://sites.ecmwf.int/openifs/openifs-data/ifsdata/48r1/

As a minimum you will require the packages ifsdata_rtables_48r1.tgz, ifsdata_climatology_48r1.tgz, and the files required for your selected horizontal grid resolution, which in the case of our example is for a T255 grid, and therefore you will at the very least need the package ifsdata_48r1_climate.v020_255.tgz.

Download and extract the files in these tarballs into the same directory in your chosen location, and the filepath of this directory should then be set to variable OIFS_DATA_DIR.