A winter weather advisory is in effect for Mason County until 4am. Snowfall is expected around noon today and four to six inches is expected before the snow ends tonight. Roads will become snow-covered and slippery beginning this afternoon and drivers should prepare for low visibilities throughout the day. Motorists are reminded to adjust speeds based on weather conditions and to take it slow. Other affected areas include Oceana, Lake, Osceola, Newaygo and Muskegon Counties.