Polar Vortex February 20 2025 Weather Predictions. The evolutions of the polar vortex will be decisive in understanding whether we will witness anticyclonic stability or if the cold will make its return. Multiple rounds of frigid, arctic air could sweep across the eastern half of u.s.

The beginning of 2025 could hold. The polar vortex, which is the big winter wildcard, is expected to stay north in the first half of winter.