What is the polar vortex and how could it impact Wisconsin's weather?

The polar vortex is a swirling mass of frigid air high in the atmosphere that normally circles the Arctic. A weakening of the polar vortex can cause it to "wobble" and send Arctic air southward, potentially bringing an Arctic blast to the northern US around Thanksgiving.

How will La Niña affect winter weather in Wisconsin?

La Niña, a cooling of the tropical Pacific Ocean, can influence the jet stream and shift the path of Arctic air, potentially leading to more volatile winter weather and increased lake-effect snow over the Great Lakes region.

What are the chances of a blizzard hitting Wisconsin this winter?

While the article does not provide specific predictions about blizzards, it does note that a weakening polar vortex and La Niña pattern can increase the risk of significant cold outbreaks and even blizzards in the northern US, including Wisconsin, around the Thanksgiving holiday and into early December.

Home / Weather / Polar Vortex Wobble May Bring Arctic Blast to Northern US Around Thanksgiving

Polar Vortex Wobble May Bring Arctic Blast to Northern US Around Thanksgiving

15 Nov

•

Summary

Potential "wobble" in polar vortex could push frigid air into northern US
La Niña and weakening polar vortex may lead to volatile winter weather
Increased risk of lake-effect snow over Great Lakes region

Polar Vortex Wobble May Bring Arctic Blast to Northern US Around Thanksgiving

According to the latest weather forecasts as of mid-November 2025, the northern US, including Wisconsin, could be in for a return of Arctic air around the Thanksgiving holiday. Meteorologists are closely monitoring a potential "wobble" in the polar vortex, a swirling mass of frigid air high in the atmosphere, which could push bitterly cold temperatures into the region.

This development comes after a recent winter storm brought over 10 inches of snow to parts of Wisconsin. While the upcoming Arctic blast is unlikely to be as intense as that previous system, it could still lead to subfreezing wind chills and an increased risk of lake-effect snow over the Great Lakes.