Severe thunderstorm warning issued, 2:39 p.m. The National Weather Service has issued a severe thunderstorm warning, effective at 2:39 p.m., for Mason and Oceana counties, until 4:15 p.m. Severe thunderstorms were located along a line ine extending from 15 miles northwest of Silver Lake to 30 miles west of Grand Haven, moving northeast at 65 mph with wind gusts of…