SIOUX FALLS, S.D. — It has been decades since parts of the Midwest experienced a deep freeze like the one expected to arrive Sunday, with potential record-low temperatures heightening fears of frostbite and hypothermia even in a region where residents are accustomed to bundling up.

This “polar vortex,” as one meteorologist calls it, is caused by a counterclockwise-rotating pool of cold, dense air. The frigid air, piled up at the North Pole, will be pushed down to the United States, funneling it as far south as the Gulf Coast.

Ryan Maue, of Tallahassee, Fla., a meteorologist for Weather Bell, said temperature records will likely be broken during the short yet forceful deep freeze that will begin in many places Sunday and extend into early this week. That’s thanks to a perfect combination of the jet stream, cold surface temperatures and the polar vortex.

“All the ingredients are there for a near-record or historic cold outbreak,” he said “If you’re under 40, you’ve not seen this stuff before.”

The temperature predictions are startling: 25 below zero in Fargo, N.D., minus 31 in International Falls, Minn., and 15 below in Indianapolis and Chicago. At those temperatures, exposed skin can get frostbitten in minutes and hypothermia can quickly set in because wind chills could hit 50, 60 or even 70 below zero.

Sunday’s playoff game in Green Bay could be among one of the coldest NFL games ever played. Temperatures at Lambeau Field are expected to be a frigid minus 2 degrees when the Packers and San Francisco 49ers kick off, and by the fourth quarter it’ll be a bone-chilling minus 7, with wind chills approaching minus 30, according to the National Weather Service. Officials are warning fans to take extra safety measures to stay warm, including dressing in layers and sipping warm drinks.

Advertisement

Minnesota called off school for Monday statewide, the first such closing in 17 years, because of projected highs in the minus teens and lows as cold as 30 below. Milwaukee and Madison, Wis., students also won’t be in class Monday. North Dakota Gov. Jack Dalrymple urged superintendents to keep children’s safety in mind after the state forecast called for “life-threatening wind chills” through Tuesday morning.

And though this cold spell will last just a few days as warmer air comes behind, it likely will freeze over the Great Lakes and other bodies of water, meaning frigid temperatures will likely last the rest of winter, Maue said.

“It raises the chances for future cold,” he said, adding that it could include next month’s Super Bowl in New Jersey.

Snow already on the ground and fresh powder expected in some places ahead of the cold air will reduce the sun’s heating effect, so nighttime lows will plummet thanks to strong northwest winds that will deliver the Arctic blast, Maue said. And there’s no warming effect from the Gulf to counteract the cold air, he said.

Even places accustomed to normally mild to warmer winters will see a plunge in temperatures early this week, including Atlanta where the high is expected to hover in the mid-20s on Tuesday.

“This one happens to be really big and it’s going to dive deep into the continental U.S. And all that cold air is going to come with it,” said Sally Johnson, meteorologist in charge at the weather service in Sioux Falls.

It’s relatively uncommon to have such frigid air blanket so much of the nation, Maue said. But in the long run, the deep temperature dives are less meaningful for comparison to other storms than daytime highs that are below zero and long cold spells, he said.

“Right now for the winter we will have had two significant shots of major Arctic air and we’re only through the first week of January. And we had a pretty cold December,” Maue said.

 


Only subscribers are eligible to post comments. Please subscribe or login first for digital access. Here’s why.

Use the form below to reset your password. When you've submitted your account email, we will send an email with a reset code.