Scattered showers and a few thunderstorms will be possible this morning across northeast Oklahoma into western Arkansas as a cold front moves through the region. Patchy fog is expected to develop late Tonight across much of eastern Oklahoma and western Arkansas as low level moisture returns in advance of the next storm system. Thunderstorms are expected to develop across eastern Oklahoma Sunday evening as a cold front moves into the region. These thunderstorms will spread to east across the area through the night. There is expected to adequate instability and deep layer shear for some of the thunderstorms to become severe. This is especially true along and south of Interstate 40 across southeast Oklahoma and west-central Arkansas. The severe storms will be capable of producing wind gusts to around 60 mph, quarter size hail and possibly a tornado. The showers and thunderstorms are expected to end Monday morning as the cold front exits the region.