ORBX comes with it's own weather themes (as in types of weather) that you can select from the weather menu, but not cloud or weather related textures.

Sager NP8671 17.3" Notebook, i74720HQ (3.6GHz), GTX 970M (3.0GB), 8GB DDR3 RAM, 1TB 7200RPM HD, TrackIR 4, CH HOTAS and rudder pedals