MILWAUKEE (AP) – A winter storm moving across southern Wisconsin has dumped up to a half-foot of snow, making roads slippery.  The Kenosha County sheriff’s office reports about 30 accidents as of mid-afternoon Thursday.   National Weather Service meteorologist Edward Townsend says 6.8 inches of snow is reported 3 miles southwest of the Kenosha airport. Other snowfall reports include 6 inches in Franksville and 5.5 inches in Racine.  Townsend says Kenosha could see 9 inches of snow by the time the storm moves on early Friday.  The Milwaukee Art Museum closed Thursday in advance of the snow.