Polar Vortex Map 2025. During winter in the northern hemisphere,. In january it was stretched polar vortex (pv) events quickly followed by a snap back to a strong pv and then the whole cycle repeating itself.
The interaction between a stable polar vortex and the block at high latitudes is crucial for the future course of winter. When the polar vortex gets weaker, or breaks up, it unleashes cold air to the south.