Polar Vortex 2025 News. The jet stream typically acts as a barrier to keep the polar vortex contained near the arctic, but at times, some of the vortex can break off or move south, bringing unusually. The stretched vortex may be setting in motion a.

The jet stream typically acts as a barrier to keep the polar vortex contained near the arctic, but at times, some of the vortex can break off or move south, bringing unusually. A strong polar vortex — and one that stays swirling tightly above the pole — depends on a dramatic contrast between frigid polar temperatures and milder conditions.