Polar Vortex Warning: Cold Air Incoming for Thanksgiving Weekend

CHICAGO, Ill. — A sudden shift in the atmosphere over the North Pole is expected to bring a wave of Arctic air to parts of the Northern Hemisphere, including the Chicago area, just in time for Thanksgiving. Meteorologists forecast that this shift, known as ‘sudden stratospheric warming,’ could lead to colder and snowier conditions across much of the central and northern U.S.

The polar vortex, a band of strong winds that contain cold air over the Arctic, is weakening, which may allow that cold air to spill southward. This atmospheric phenomenon is becoming significant in November, according to experts, who generally see such events unfold later in winter.

“We might start experiencing colder than normal conditions as soon as the week of Thanksgiving,” said Kevin Jeanes, a meteorologist with NBC 5 Storm Team. “This event could potentially disrupt the polar vortex and send colder air to our region.”

The National Weather Service’s Climate Prediction Center has indicated that the combination of the current La Niña, the Madden-Julian Oscillation, and this rare November warming could trigger a significant pattern change mid to late November, affecting the West and Northern and Central Plains.

According to forecasts, parts of the Midwest may experience temperatures significantly lower than average and even the possibility of heavy snowfall as early as December. Although the initial cold blast may not yield sub-zero temperatures, residents should prepare for a drop into the 20s.

“We can see more active and shifted storm tracks, which may lead to snowstorms,” explained Andrea Lopez Lang, a meteorologist at the University of Wisconsin-Madison. “It’s difficult to say exactly where the cold air will land, but we’re keeping a close eye on it.”

This change comes unusually early in the winter season, making accurate forecasts challenging. The jet stream will be a crucial player in determining where the snow and cold air will flow as well.

As the polar vortex trembles, condition changes in the atmosphere can lead to rapid temperature fluctuations, making it important for meteorologists to monitor the situation closely.

While snow is a possibility, early indications show that significant snowfall may stay south of Chicago until early December. The NBC 5 Storm Team will continue to provide updates to ensure residents are prepared for the upcoming cold snap.