The polar vortex is returning. What's its role for winter?

A stronger-than-normal polar vortex is currently taking shape over the North Pole. While this development might appear to be a recipe for a brutally cold winter, the situation is not that simple. The return of the polar vortex plays a specific role in winter weather patterns, but its strength does not directly translate to a guaranteed extreme cold period. Experts indicate that the relationship between the vortex and winter temperatures involves more complex atmospheric dynamics.