Polar Vortex 2025 Predictions North America. In addition, the stratospheric polar vortex is now stretching down across north america. However, during winter months, disruptions in the jet stream can cause the polar vortex to weaken and expand, allowing icy arctic air to spill southward into regions like north america, europe.

When the polar vortex gets weaker, or breaks up, it unleashes cold air to the south. The polar vortex would not be the wall that air masses/winds in the north pacific seem to be hitting or diverting around because the altitudes where these two things (the.