Upcoming Polar Vortex 2025 Forecast. For the gefsv12 forecast issued on 18 december 2024, the winds at 60 degrees north (the mean location of the polar vortex) are forecast to remain stronger than normal for at least the next 2 weeks (bold red line). A weaker polar vortex usually means a weaker jet stream, which increases the chance of a more dynamic (colder/snowy) winter pattern over the united states, canada, and/or europe.
December 31, 2024 at 9:40 am est. In its january to march 2025 outlook, the nws said polar vortex winds were expected to remain strong through january, meaning there was a low to medium (20 to 50 percent) chance of a modest cold.
