Clusters of heavy to severe thunderstorms will sweep through the central United States into Monday, threatening to not only disrupt outdoor plans, but also inflict damage in some communities. Cookouts over Father's Day weekend may have to be brought inside, and dads spending the holiday golfing, fishing or biking will need to keep a close watch on the sky. "Whether storms become violent or not, all storms can pose lightning dangers for those with outdoor plans," AccuWeather Senior Meteorologist