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 video presenting the new feature of upcoming AtmosFear 3 for S.T.A.L.K.E.R. Call of Pripyat - psi storm. Psi storms are the new kind of weather anomaly that is very dangerous to unequipped stalkers. Psi radiation cumulates in vortexes which generate high psi levels when they discharge. Decent armor/drugs protection reduces the mind damage but the vortexes are still dangerous as they generate hi-voltage electrostatic damage in close distance.