SIOUX FALLS. S.D. (AP) -- An approaching winter storm has some school districts in South Dakota canceling classes.

The National Weather Service posted a winter storm warning for much of central and eastern South Dakota Friday. That warning stretches into southwestern Minnesota and southern Wisconsin.

Forecasters expect 4 to 7 inches of widespread heavy snow in South Dakota. Sioux Falls, Brandon Valley and Dell Rapids are among the schools closed Friday. Winds of 15 to 25 mph could cause blowing snow in rural areas.