Polar Vortex: What is the weather phenomenon and how should you prepare for one?

As frigid temperatures and life-threatening winds batter parts of the US, cities in the Midwest are shuttering to keep citizens inside and safe from the dangerous cold. The sudden extreme temperatures are the result of a polar vortex, a weather phenomenon that occurs in the winter and impacts parts of the northern hemisphere. What is a polar vortex?

from Yahoo News - Latest News & Headlines https://yhoo.it/2UvMqVY