[Blitz_]

niiicceeee. WEll an easy way to do weather effects is through the use of brushes. Go to devian arts website and do a resource serach for brushes, search for grunge brushes etc, furthermore u can assign textures to brushed for a more realistic appearance. Or u can do the foolproof google search for photoshop brushes, their are thousands, but devian art is ur best bet.