Winter storm warning extended until 4 p.m. Friday. OCEANA COUNTY — The US National Weather Service extended the winter storm warning until 4 p.m. Friday, Jan. 7, for Oceana, Mason and Muskegon counties. Expect heavy snow with additional snow accumulations up to 8 inches. Plan on slippery road conditions. “The western halves of Mason, Oceana and Muskegon counties will be…