A dangerous winter storm that's walloped the upper Midwest is pushing toward the Great Lakes and the Northeast, threatening heavy snow, freezing rain and treacherous travel conditions for tens of millions on Saturday.
About 6 to 12 inches of snow could fall from parts of Michigan to New England through Sunday, the National Weather Service says.
Further south, a wintry mix is expected to hit parts of the Midwest and the northern Mid-Atlantic states, with up to a half-inch of ice accumulations possible.
At the storm's back end, blizzard conditions -- high wind gusts and blowing snow -- still are possible into Saturday afternoon for parts of the Dakotas, Minnesota and Iowa, where the weather has created havoc on some roads since Friday.
In Minnesota, at least 230 vehicles spun off the road, and at least 218 crashes were reported throughout the state from Friday morning to Saturday morning, the Minnesota State Patrol said.
Authorities in those states urged would-be drivers to stay home -- and terrifying video from western Iowa drove the point home.
While an Iowa state trooper was helping a delivery driver whose truck was in the snowy grass off Interstate 80 on Friday, a pickup truck slid off the highway. The pickup slammed into the delivery truck, narrowly missing the delivery driver, who scattered out of the way, video from the delivery vehicle showed.
The video wasposted to Twitter by the Iowa State Patrol. No one was injured in the incident.
Timing and impacts through the day
The snow should wrap up for the Midwest by early afternoon. Much of Minnesota, Michigan and northern Iowa could be left with a foot of snow.
Eastern cities like New York, Boston and Philadelphia will get a quick shot of snow during the afternoon.
"This will be another tricky forecast for the big cities along the I-95 corridor," CNN meteorologist Taylor Ward said.
Precipitation will begin as snow on Saturday before warmer air brings a transition to rain.
"New York City and Boston will likely see 2 to 4 inches of snow before everything ends as rain Saturday night and early Sunday," Ward said.
Areas farther inland have a better chance of remaining in the snow and will likely see slightly greater amounts.
Interior portions of the Northeast could see 8 to 12 inches for upstate New York and up to 6 inches in northern Maine.
Parts of the Ohio Valley could be left with a severe coating of ice. Up to a quarter-inch of ice could accumulate in places like Indianapolis, St. Louis, and Cleveland.
Washington, DC, could even get a little glazing of ice before changing over to rain.
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Expect significant travel headaches in the snow-impacted areas. Flights will be delayed or even canceled, so check with your airlines before traveling.
Airports in cities like Chicago, New York and Boston could be affected the most by Saturday's weather.
Road travel will be treacherous as well. Windy conditions will create blowing snow and near-whiteout conditions in some of the hardest-hit areas across the Midwest.
"Winds across these regions may gust to over 50 mph, producing considerable blowing and drifting of snow and life-threatening travel conditions," according to the weather service.
Bitter cold will follow the storm
Behind the system, bitterly cold temperatures will settle in for the end of the weekend and start of the week.
"Much below average temperatures likely in this arctic air with temperatures as much as 20 degrees below average," according to the weather service.
"After the storm moves out, the bitter cold will settle in. High temperatures in the region will remain in the single digits Sunday and into the early part of next week, while overnight temperatures will dip to 10 to 20 degrees below zero," says Ward.
Minneapolis will drop below zero Sunday, Monday and Tuesday mornings. Temperatures will only make it into the single digits on Sunday. Chicago's lows will be in the single digits Sunday through Tuesday morning, with highs in the teens and low 20s.
Windy conditions will make temperatures feel much colder.
Wintry mess on Friday
Ice prompted a temporary closure at Kansas City International Airport in Missouri on Friday, where a plane slid off the runway while taxiing from the airport terminal, an airport spokesman said. There were no known injuries.
In Guymon, Oklahoma, the ice was so slick that resident Kassidy Stroup couldn't stand up in her driveway. She shared a video of her futile struggle to open the door to her truck as she slid this way and that on the icy path.
Stroup planned to head into work later, she told CNN, after the ice had thawed a bit.
Jenni Pittman, a science and operations officer at the National Weather Service, posted to Twitter Friday a time-lapse video of icicles forming on the eave of her home's roof in Olathe, Kansas.
Pittman was teleworking, she said, but her husband said the roads were "just barely passable."
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