What happens if we accidentally add extra variable in grib era5 file ?

[Manuarii]

Hi,

I recently noticed that I had been downloading extra variables from ERA5—such as total precipitation, cloud cover, and surface net solar shortwave radiation—yet WPS and WRF continued to run correctly. My question is: Are these extra variables actually read or used by WPS or WRF?

The issue arose when I attempted to run simulations over several days. For most of those days, I downloaded the extra variables, but for one file, I excluded them. In this scenario, WRF (when running real) crashes without explanation after successfully generating the `metgrid` files. The crash occurs even though the `metgrid` output appears to be correct.

Thanks for help,

 

[kwerner]

Hi,
The variables that are read from the input files are those that are listed with codes in the Vtables. If the variable is not in the Vtable, it will just be ignored by ungrib. I can't explain why, when you didn't have the extra fields in the file, it caused issues for real - perhaps something was also missing for one of the mandatory fields? Either way, if using the files with the extra variables gets you past the real.exe issue, then I'd recommend just doing that for now. If you're still having issues running real.exe, start a new thread in the WRF section of the forum and we will address it there.