Millions across Plains and Midwest face heavy snow, deep freeze over the weekend

A wintry mix was making a mess Saturday in pockets of the northern Plains and Midwest — a snowy and bitter blast that will move eastward into Monday, allowing for a potentially treacherous commute for millions.

About 25 million people are bracing for the storm system as it marches across the Midwest late Saturday into Sunday — ahead of plunging temperatures that will fall below zero in Chicago and bring a deep chill to the Northeast next week.

"This is certainly going to be the coldest air this year," said Weather Channel meteorologist Kelly Cass.

Whiteout conditions have been reported in North Dakota and dangerous ice-slicked streets and trees in Portland, Oregon, where authorities were inundated with nearly 400 emergency requests through Friday night.

In one incident, 75 to 100 people had to be rescued from inside a light rail train that stopped when a high-voltage power line fell on the tracks, Portland Fire & Rescue tweeted.

Related: Take a look back at Winter Storm Jonas:

18 PHOTOS
#Blizzard2016 aka Winter Storm Jonas slams the east coast
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#Blizzard2016 aka Winter Storm Jonas slams the east coast

A massive winter storm system pummeled the eastern United States in late January 2016, with two low-pressure systems merging into a potent nor’easter that dropped heavy snow from Virginia to New England. By late afternoon on Jan. 23, snowfall totals were approaching records in several states, and hurricane-force winds were battering the coastlines and leading to serious flooding. The storm was expected to continue through the morning of Jan. 24.

The Visible Infrared Imaging Radiometer Suite (VIIRS) on the Suomi NPP satellite acquired this image of the storm system at 2:15 a.m. EST on Jan. 23. It was composed through the use of the VIIRS “day-night band,” which detects faint light signals such as city lights, moonlight, airglow, and auroras. In the image, the clouds are lit from above by the nearly full Moon and from below by the lights of the heavily populated East Coast. The city lights are blurred in places by cloud cover.

(Photo via NASA)

NEW YORK, NY - JANUARY 23: A woman walks in strong winds and heavy snow fall in Central Park on January 23, 2016 in New York City. A major Nor'easter is hitting much of the East Coast and parts of the South as forecasts warn of up to two feet of snow in some areas. (Photo by Astrid Riecken/Getty Images)
TOPSHOT - A man use a skiing on a snow covered street in Manhattan in New York on January 23, 2016. A deadly blizzard with bone-chilling winds and potentially record-breaking snowfall slammed the eastern US on January 23, as officials urged millions in the storm's path to seek shelter -- warning the worst is yet to come. US news reports said at least eight people had died by late Friday from causes related to the monster snowstorm, which is expected to last until early Sunday. / AFP / KENA BETANCUR (Photo credit should read KENA BETANCUR/AFP/Getty Images)
TOPSHOT - A pedestrian walks in the center of a snow-covered residential street in Washington, DC on January 23, 2016. A deadly blizzard with bone-chilling winds and potentially record-breaking snowfall slammed the eastern US on January 23, as officials urged millions in the storm's path to seek shelter -- warning the worst is yet to come. / AFP / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

January 22, 2016

Scott Kelly ‏(@StationCDRKelly): Massive #snowstorm blanketing #EastCoast clearly visible from @Space_Station! Stay safe! #blizzard2016 #YearInSpace

TOPSHOT - A man lays in a pile of snow in Times Square on January 23, 2016 in New York. A deadly blizzard with bone-chilling winds and potentially record-breaking snowfall slammed the eastern US on January 23, as officials urged millions in the storm's path to seek shelter -- warning the worst is yet to come. US news reports said at least eight people had died by late Friday from causes related to the monster snowstorm, which is expected to last until early Sunday. / AFP / Don EMMERT (Photo credit should read DON EMMERT/AFP/Getty Images)
CAPE MAY, NEW JERSEY - JANUARY 23: Waves crash on the beach on January 23, 2016 in Cape May, New Jersey. A major snowstorm is upon the East Coast this weekend with some areas expected to receive over a foot of snow. (Photo by Andrew Renneisen/Getty Images)
WASHINGTON, DC - JANUARY 22: Nuns from the Fraternite Notre-Dame in Chicago, Illinois are covered in newly fallen snow as they walk along Constitution Avenue while snow begins to accumulate January 22, 2016 in Washington, DC. A major snowstorm is forecasted for the East Coast this weekend with some areas expected to receive up to 1-2 feet of snow. (Photo by Win McNamee/Getty Images)
Snow covers cars parked in Washington on January 23, 2016. A deadly blizzard with bone-chilling winds and potentially record-breaking snowfall slammed the eastern US on Saturday, as officials urged millions in the storm's path to seek shelter -- warning the worst is yet to come. US news reports said at least eight people had died by late Friday from causes related to the monster snowstorm, which is expected to last until early Sunday. / AFP / Mladen ANTONOV (Photo credit should read MLADEN ANTONOV/AFP/Getty Images)
TOPSHOT - A man pushing a snow plough during a snowstorm January 22, 2016 in New York. / AFP / FRANCOIS XAVIER MARIT (Photo credit should read FRANCOIS XAVIER MARIT/AFP/Getty Images)
A man walks on snow covered Thomas Circle in Washington on January 23, 2016. A deadly blizzard with bone-chilling winds and potentially record-breaking snowfall slammed the eastern US on Saturday, as officials urged millions in the storm's path to seek shelter -- warning the worst is yet to come. US news reports said at least eight people had died by late Friday from causes related to the monster snowstorm, which is expected to last until early Sunday. / AFP / Mladen ANTONOV (Photo credit should read MLADEN ANTONOV/AFP/Getty Images)
WASHINGTON, DC - JANUARY 22: A snowplow cleans up snow on Pennsylvania Avenue in front of the U.S. Capitol January 22, 2016 in Washington, DC. A winter snowstorm is forecasted for the East Coast this weekend with prediction of up to 30 inches of snow for the DC area. (Photo by Alex Wong/Getty Images)
TOPSHOT - The White House is seen during a snowstorm in Washington January 22, 2016. Thousands of flights were cancelled and supermarket shelves were left bare Friday as millions of Americans hunkered down for a winter storm expected to dump historic amounts of snow in the eastern United States. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
TOPSHOT - People cross 15ht Street during a snowstorm in Washington January 22, 2016. Thousands of flights were cancelled and supermarket shelves were left bare Friday as millions of Americans hunkered down for a winter storm expected to dump historic amounts of snow in the eastern United States. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
A Homeless covers from the snow in Central park on January 23, 2016 in New York. A deadly blizzard with bone-chilling winds and potentially record-breaking snowfall slammed the eastern US on Saturday, as officials urged millions in the storm's path to seek shelter -- warning the worst is yet to come. US news reports said at least eight people had died by late Friday from causes related to the monster snowstorm, which is expected to last until early Sunday. / AFP / KENA BETANCUR (Photo credit should read KENA BETANCUR/AFP/Getty Images)
A man walks past a restaurant during a snowstorm January 22, 2016 in Washington, DC. Thousands of flights were cancelled and supermarket shelves were left bare Friday as millions of Americans hunkered down for a winter storm expected to dump historic amounts of snow in the eastern United States. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
CHAPEL HILL, NC - JANUARY 22: Vehicles move along Interstate 40 as an overhead sign indicates 'Winter Weather Warning In Effect' during a winter storm on January 22, 2016 in Chapel Hill, North Carolina. A major snowstorm is forecasted for the East Coast this weekend with some areas getting a possible one to two feet of snow. (Photo by Lance King/Getty Images)
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Already, a whopping 3 feet of snow fell in suburban Cleveland with more than 9 inches reported overnight Friday in the small city of Kirtland, according to the National Weather Service.

Other parts of the Great Lakes region could see up to a foot of snow by the time the storm dissipates this weekend, forecasters said. Parts of eastern Ohio, northwestern Pennsylvania and western New York could get walloped with 4 to 6 inches, and even 8 to 10 inches in some areas.

Earlier this week, the pre-winter weather led to traffic pileups in Michigan, where three people were killed, and Erie, Pennsylvania, where Interstate 90 was temporarily shut down.

The snow threat will continue into Monday morning, although Northeast states along the Interstate 95 corridor are expected to see rain by the afternoon, forecasters said.

Meanwhile, another round of snow is in store for the Pacific Northwest and the Plains this weekend. By Monday, snow totals will reach as much as 2 feet in some parts of Washington state, Oregon, Idaho, Montana, Colorado, Utah and Wyoming, The Weather Channel reported.

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