Polar Vortex 2025 March 2025. A weaker polar vortex usually means a weaker jet stream, which increases the chance of a more dynamic. A polar vortex is said to hit the u.s.
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. Observed and forecasted (noaa gefsv12) wind speed (top) and temperature (bottom) in the polar vortex compared to the natural range of variability (faint shading).