Arctic air will reach down from Canada and take hold on the Upper Midwest down through the Midwest area. The image below is Monday night’s image.
We can see the extreme cold, especially over the North Plains, Upper Midwest reaching into the Great Lakes and Midwest.
Below is Tuesday’s high temperatures forecast.
The Plains are heavily impacted by this cold outbreak as high temperatures will struggle to reach above 10 degrees in many locations.
Below is Tuesday night’s forecast lows.
As temperatures plummet again Tuesday night, notice how cold the temperatures will be in Chicago, Minneapolis. A lot of this cold is due to snowpack helping the temperatures dive further.
In a large section of the Plains, lows on Wednesday night will not get above 0 degrees. Below is Wednesday’s lows.
We can see the cold still holding a tight grip on the Plains, Great Lakes and Midwest on Wednesday night.
On the topic of a ‘cold-day’, should school be cancelled for the cold, a line of Chicago northward has potential, while areas north of Wausau Wisconsin are likely. See the below graph.