On Earth and other planets, the surfaces spherical shape and rotation lead to a Coriolis effect or force which causes large storms and weather systems to rotate (clockwise in the Northern hemisphere and anti-clockwise in the Southern).
In a large Ringworld system (Either Niven style around a star or HALO style in an orbit) there would be a coriolis force but it would act much differently than on a planetary surface.
How would this affect large storm formation and what would be the rotation direction of the storm?