Ice balls washed onto the shore of Lake Superior near Ashland, Wisconsin, on December 5, as the National Weather Service (NWS) said strong winter winds hit communities along the Great Lakes.Photographer Cheryl Koval, who lives in Ashland on the shore of Lake Superior, captured the footage in Chequamegon Bay. She regularly posts videos showcasing winter weather in the region.According to the NWS, the ice balls develop when “lake-effect snow combines with the cold temperatures to form a layer of floating slush that wave action sculpts into spheres,” which then wash onto the shore and freeze solid. Credit: Cheryl Koval (Extreme Photography Koval) via Storyful