The weather report for Mason County is sponsored by Superior Electric of Ludington: 231-845-0126; www.supelectric.com. The National Weather Service in Grand Rapids has issued a significant weather advisory for the area. At 9:33 a.m. radar indicated strong thunderstorms along a line extending from Hesperia to Belding to St. Johns to Williamston, moving northeast at 30 mph. Frequent dangerous cloud to ground…