CHICAGO (CBS) — Some Chicago residents are waking up to the first snow of the season and there's more to come. During the early Thursday morning commute, expect a few passing flurries/snow showers but no major road impacts. The widespread snow moves in after 7 a.m., which will aid in slushy accumulations on the roads and reduced visibility.

Winter is tightening its icy grip across much of the country, with a string of states slapped with weather warnings this week amid fears of treacherous conditions. Reduced visibility and heavy snow—up to 6 feet of snow accumulation in some parts—are forecast just days away from Thanksgiving.

Winter weather advisories go in effect Tuesday night for the Palmer Divide ridge in central Colorado and the state's southern foothills.Start the day smarter. Get all the news you need in your inbox each morning.