This is a set of scripts and tables for downloading the ERA5 data and preprocessing it to drive WRF simulations.

Following are descriptions of each subdirectory's content:

These python scripts download ERA5 data using the cdsapi python package.

For these scripts to work, you need to install the package via pip and have the .cdsapirc file ready in the home directory.

For ungrib.exe of WPS to work (with the Vtable file downloaded from dreambooker.site), you need to convert the ml data (model level data) to grib1 first using grib_set -s deletePV=1,edition=1 era5.20210701-20210901.ml.grb era5.20210701-20210901.ml.grib1.

The sfc data is already in GRIB1.

• First use link_grib.csh to link the downloaded grib1 files for ml and sfc ERA5 data here.

• Make sure the Vtable is linked to the correct one (Vtable.ECMWF_sigma).

• Run ungrib.exe with the right namelist.wps for meteorological fields.

• Run calc_ecmwf_p.exe (ecmwf_coeffs is needed) to generate the pressure levels for ERA5.

• Run metgrid.exe with the correct METGRID.TBL.ARW (just have both METGRID.TBL and METGRID.TBL.ARW here), namelist.wps (should be the same one as that in ungrib) and geo_em.d01.nc.

• Bill said when geo_em.d01.nc is missing, WPS may complain that METGRID.TBL is missing instead unless you use higher debug levels.