Current Polar Vortex Map 2025. 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,. A researcher expects the polar vortex to strengthen over the next two weeks.

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,. Conversely, a weakened polar vortex allows the cold air to escape southward, affecting the united states, canada, and europe with more severe winter.