Polar Vortex 2025 March Predictions. The strongest polar vortex years (dark purple dots) cluster in the upper left quadrant of the graph, meaning winters with westerly qbo and la nina. After that, the forecast average.

Winter in the northern hemisphere is shaping up to be a period of great atmospheric dynamism, with the polar vortex (pv) playing a crucial role. Based on the recent forecast models, the full breakdown of the polar vortex into a major sudden stratospheric warming is expected to be brief.