This mod removes all the thunderbolt calls from the games weather system. You'll still get rain storms, just no thunder/thunderbolts/lightning.
This mod was made by ost3g0, so that lower-end graphics cards could manage to handle using Object Dynamic Lighting and still have a sort-of-nice looking game without having to endure the lag caused by the lighting.
Extract the files to your S.T.A.L.K.E.R. main directory.
If by chance you are using any other mod that deals with the weather system chances are this will not be compatible.
No bugs/conflicts encountered on the old version of the game or on the new one.