The Next Polar Vortex 2025 Forecast. Such plunges occur when the air currents that keep frigid air over the north pole — the polar vortex — weaken, and the freezing arctic air slips south and pushes the vortex. Relative stability and blocks at high latitudes the dynamics of the polar vortex continue to show alternating episodes of stretching and relaxation, typical of this.

A negative nao is much more common in a la nina year than. For the gefsv12 forecast issued on 18 december 2024, the winds at 60 degrees north (the mean location of the polar vortex) are forecast to remain stronger than normal for at.