Polar Vortex Chicago 2025 Forecast. The polar vortex parks itself over eastern canada for the first couple weeks of 2025 and allows these cold shots to slide southeast and dominate the weather east of the rockies. When the polar vortex gets weaker, or breaks up, it unleashes cold air to the south.
Early data shows that the polar vortex is likely to be weaker than normal in the winter of 2024/2025. On tuesday, after the first significant winter storm of the year blasted a huge swath of the country with ice, snow and wind.