A lobe of the Polar Vortex is going to swing through Ontario just north of Michigan. The upper-air forecast gives us an easy look at this strongest winter player.

Recent forecasts suggest some Americans might be getting a much-needed break from the freezing temperatures that have gripped much of the country.

This can form what is called a Polar Vortex. This isn’t anything new, it’s just a newer term. This is when the area of high pressure moves south off the pole, hence polar and the jet dips even further south with an area of low pressure,