The latest developments in a storm bringing snow to parts of the Midwest. All times local:

8:15 p.m.

The Illinois Department of Transportation is reporting snow and ice covering roads in northwestern Illinois as the season's first winter storm rolls in.

The department says U.S. Highway 20 from East Dubuque to Stockton is totally covered with snow or ice. Conditions are better from Stockton to Rockford, but there are scattered slick spots.

The National Weather Service cautions that snow can cause as much trouble on roads in the early hours of a winter storm as in later hours. That's because drivers are getting accustomed to conditions and there may be heavier traffic.

A winter storm warning with up to 10 inches of snow is in effect in northern Illinois through Saturday afternoon. Parts of central Illinois are expecting up to 6 inches.

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6:20 p.m.

Weather officials say portions of northern Iowa could get more than a foot of snow as a winter storm moves through the state.

The National Weather Service says heavy snowfall was expected Friday evening into early Saturday in parts of northwest and north central Iowa. Meteorologist Kevin Skow says the heaviest snow band is expected to fall from Sioux Falls, South Dakota, down to Dubuque.

Skow says pockets of Iowa will receive more than a foot of snow. Others will get at least 9 inches.

Road conditions are deteriorating as they get covered in snow or ice. Winds of up to 25 mph in some areas will produce blowing and drifting.

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3:30 p.m.

Northern Illinois is bracing for its first snow of the season with 6 to 10 inches expected. Cities across the region are preparing snow-removal trucks and reminding drivers to give plows plenty of room.

Utility company ComEd says it is increasing staffing to make sure crews are ready to respond to power outages.

The National Weather Service issued a winter storm warning for Friday night and Saturday for northern Illinois. The weather service says rain and snow in the early evening will turn into wet snow through Saturday afternoon.

Snow in November is common in the region, but more than 6 inches is somewhat unusual. The weather service says its records show two previous big snowfalls in November in Chicago: 8 inches on Nov. 6, 1951, and 7.5 inches on Nov. 26, 1975.

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12:30 p.m.

Snowfall in southern South Dakota and northwest Iowa will likely top a foot in some places as the Midwest's first significant wintry storm chugs east.

National Weather Service Meteorologist Brad Temeyer says snowfall in Sioux Falls will dwindle in the afternoon. He also says there's an unusually drastic difference in snowfall between the northern and southern portions of South Dakota's most populous city.

Heavy weekend snow is also in the forecast for parts of Wisconsin, Michigan and Illinois.

Bret Brown is a cashier at Roadway Express in Sioux Falls. He says tractor-trailers are pulling off slow-moving interstates to park for the day.

A spokesman for the South Dakota Highway Patrol says troopers have been busy with weather-related crashes in the Sioux Falls and Rapid City areas. Accident totals weren't immediately available.

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9:15 a.m.

Morning commuters in southern South Dakota dealt with slick roads, accidents and backed-up traffic as a snowstorm began developing over parts of the Midwest.

The National Weather Service says it's the first significant snowstorm of the season, with widespread amounts of 4 to 8 inches of snow expected from Nebraska to Michigan with up to a foot in isolated spots.

Winter storm warnings or advisories are posted for all of southern South Dakota. Up to 8 inches of snow is expected in the southeast along with winds gusting to 20 mph, reducing visibilities to less than a mile.

Heavy weekend snow — up to 10 inches — is in the forecast for Michigan, Wisconsin and northern Illinois.