Areas of fog will primarily impact the western South Dakota plains early this morning. An active weather pattern will continue to bring daily thunderstorm chances to the region through the weekend and into early next week. Today, thunderstorms are expected to affect the area this afternoon and evening, with severe weather anticipated, particularly across northeastern Wyoming, the Black Hills area, and southwestern South Dakota. Large hail and damaging winds are the main threats. The potential for severe thunderstorms will return Saturday afternoon and evening, again with large hail and damaging winds as the primary concerns.