American (GFS) model showing lobe of polar vortex diving into the northern Great Lakes from Tuesday through Thursday next week. (PivotalWeather.com) Jason Samenow
One of the most severe cold air outbreaks in years is possible from the Upper Midwest to the Northeast next week as the jet stream crashes south and a large lobe of the polar vortex plunges toward the Great Lakes.
Computer models forecast the brutal cold to crash into the Northern Plains and Upper Midwest starting Tuesday. The core of the frigid blast would grip the region from the Dakotas to the eastern Great Lakes on Wednesday and Thursday, sending cities such as Minneapolis, Des Moines, Green Bay, Milwaukee, Chicago and Detroit into a teeth-chattering freeze.
Confidence in a significant outbreak of Arctic air is high, but it’s too soon to project its exact strength and final legacy. Model predictions for the intensity of the cold snap range from historic and record-breaking to rather run-of-the-mill for midwinter.
The primary simulation from the American modeling system forecasts temperatures in the Midwest and Great Lakes next Wednesday to be 40 to 50 degrees colder than normal — which is a massive anomaly in the heart of winter when it is already very cold. Cold of this intensity would be extremely dangerous — producing widespread wind
Article source: https://www.washingtonpost.com/weather/2019/01/24/extreme-arctic-outbreak-possible-next-week-polar-vortex-targets-northern-us/