(Undated) -- A winter storm could hit parts of northern Iowa later this week. The National Weather Service says areas from Sioux City to Mason City and Decorah could see anywhere from a couple inches to around a half-foot of snow Friday. Areas between Mason City and Des Moines could also see some snow but Des Moines likely won’t see any accumulation. A winter storm watch will be in effect for northern Iowa from noon Friday to 6:00 a.m. Saturday.