AtmosFear is a mod for S.T.A.L.K.E.R. - Call Of Pripyat that tweaks and expands the vanilla weather system to be more realistic and various.
The new Absolute Texture pack is coming. This time with 5 different styles to choose from. Each area could have a different style applied so if you want Zaton to be rotten, Jupiter with dry autumny look and Pripyat completely dead at the same time, get Absolute Nature 2.