How to rotate grids

[annalisa88]

Hi everyone,
I'd like to run WRF over a rotated domain. Now, I'm using a mercator projection centered on Europe.
In this case, I can only define in &geogrid the map projection (Lambertian) and ref_lat/ref_lon but I can't set a rotation angle.
I would rather avoid Lat-Lon projection by working on medium latitudes...
Has anyone already had my own need?
Thank you all