Sioux Falls, S.D. (KELO-AM) - The National Weather Service says winter storm warnings and advisories are in effect for much of the region tonight and Sunday. Expect deteriorating conditions through the evening and overnight hours as snow and wind spread across much of the area. Expect the heaviest snowfall totals of 6 to 10 inches across much of northwest Iowa and parts of extreme southeast South Dakota and southern Minnesota. Snowfall totals of 2 to 6 inches will be common elsewhere with lighter amounts further to the northwest.