Snow likely will continue in that region through Friday's evening rush hour and move into the Northeast.
Almost 1,500 flights were canceled at Detroit and Chicago airports - more than half at O'Hare, where seven inches (18 cm) of snow had accumulated by noon. Mostly cloudy, with a high near 23.
Heavy snow possible. Total snow accumulations of 4 to 8 inches are possible. Temperatures are going to plummet overnight with lows in the single digits. Chance of precipitation is 20 percent. The high will be near 23 degrees. Winds could gust as high as 22 miles per hour. Wind chill values as low as -2. Southwest wind 5 to 10 miles per hour.
That National Weather Service also forecasted that after its winter storm warning expired Friday night, another round of snow was expected Friday into mid-morning Saturday and early Sunday morning into late Sunday morning.
The snow will become heavy at times tonight, with periods of snow then continuing through the day on Friday.
The National Weather Service said the significant winter storms threatened heavy snow, strong winds and risky travel from the northern Rockies to the Northern Plains and the upper Midwest through Sunday in some parts. Light snow is expected through midnight, but snow will pick up in intensity starting after midnight and last through the morning commute. Snow bands can be moderate to heavy at times, significantly reducing visibilities and causing slippery and slick roads.
"Travel will be risky and almost impossible", the service said, warning that ice may cause widespread power outages.
18 News is following a developing weather situation Wednesday morning - a winter storm is slowly moving closer to the Twin Tiers.
If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. The city won't hit the side streets in full force until after the snow stops.