Upcoming Polar Vortex 2025 Forecast. The battle continues and in the impacts section i discuss the competing influences of a strong polar vortex (pv) and high latitude blocking on the upcoming weather in the n orthern hemisphere (nh). Overall, this means that a la niña event is.

A stronger and more stable polar vortex, which can limit the southward movement of arctic air. 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 down.