A persistent weather pattern driving bitterly cold air south out of the Arctic will cause temperatures from Minnesota to Kentucky to plummet Monday, turning this winter into one of the coldest on record in some areas.
For about 2½ days, actual temperatures will range from the teens to below zero, and the wind chills with be even colder, minus 43 in Minneapolis, minus 23 in Milwaukee and Chicago, minus 14 in Kansas City, Mo., and minus 3 in Louisville.
In fact, the National Weather Service says most of the Midwest will feel far colder than Monday's expected high in the nation's northernmost city, Barrow, Alaska -- minus 4.
National Weather Service Meteorologist Scott Blair stopped short of calling the latest round of cold part of the polar vortex, which are winds that circulate around the North Pole.
"There's really nothing abnormal about the air that's coming into the area," he said. "It's just been a very persistent pattern" of cold air.
He said it's an amplified pattern of the jet stream, and cold air is filtering in behind a large trough of low pressure. He explained further: "Troughs are typically associated with unstable or unsettled weather, and, at this time of the year, much colder air."
Sunday's weather and Monday's forecast led airlines flying in and out of Chicago's two major airports to cancel nearly 400 flights.
The city's Department of Aviation announced Sunday in a telephone recording that O'Hare International Airport canceled more than 265 flights as of 8:30 p.m. Sunday. At Midway International Airport, more than 130 flights had been canceled and some were delayed up to 2 hours.
With temperatures expected to plummet below zero on Monday, many more flights could be canceled. During another cold snap earlier this month, airlines canceled more than 1,000 flights in Chicago over a two-day period.
The aviation department recommended travelers and those picking up travelers visit the airlines' web sites for flight status before coming to the airports.
In the Chicago area, residents were bracing for a historic deep freeze. Monday's high was expected to be minus 4 degrees, and it could get as low as negative 17 downtown, with wind chills as low as 40 below. Such temperatures are expected to hold into Tuesday.
If Chicago makes it to 60 hours below zero, it will be the longest stretch since 1983, when it was below zero for 98 hours, and the third longest in 80 years.
Chicago Public Schools called off Monday's classes for its nearly 400,000 students a day in advance, as did suburban districts. Earlier this month, when it was below zero for 36 straight hours, CPS closed for two days.
North Dakota and South Dakota residents dealt with dangerous cold Sunday and wind gusts that reached up to 60 mph. The high winds led to blowing snow that made it nearly impossible to travel in some parts.
"This is definitely the most widespread event we've had this year," said weather service meteorologist Adam Jones in Grand Forks, N.D.
Snow and high winds in Indiana led officials there to restrict vehicle traffic or recommend only essential travel in more than half of the state's counties. And Iowa officials said the combination of snow and high winds would make traveling dangerous; forecasters there called for wind chills to be as low as 40 below zero on Monday.
In Michigan, snow on the roads and deep subfreezing temperatures contributed to multiple crashes Sunday that forced expressway closings. And on Saturday night, two people were killed in Grand Haven Township in western Michigan because of similar weather conditions, authorities said.
Alex Alfidi, manager at Leo's Coney Island restaurant in the Detroit suburb of Birmingham, said the extreme winter weather is hurting his business.
"We slowed down big time," Alfidi, 39, said, noting that while he's been getting some carryout business, the casual walk-in customers have been staying away.
He also said it's hard for him and his employees to get to and from work in the snow, ice and cold. Sometimes, the 24-hour restaurant is operating with just him and a waitress.
Alfidi said he has seen some challenging winters in 15 years in Michigan, but none as bad as the current winter.
"This is the biggest one," he said.