Polar Vortex Breakdown Raises Winter Weather Concerns Across Europe and North America
Somewhere around 30 kilometers above the Arctic, the atmosphere is doing something forecasters rarely see this early. And it could shape the winter you’re about to have.
What Is the Polar Vortex Breakdown?
The polar vortex is a ring of fast winds that normally keeps frigid air bottled up near the North Pole. This year that ring is faltering. A breakdown in November is very rare, because the vortex is usually stable and strengthening at this point. Forecasters call it sudden stratospheric warming, or SSW. The wind reversal was forecast to be the earliest on record, in data going back to 1958.
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By early November, all 50 members of a European model ensemble showed the high-altitude winds reversing by November 21. Canada’s Weather Network has since described it as a historic reversal that makes the forecast much less straightforward than it was a few weeks ago.
Why It Matters for Your Winter
A weaker vortex can let Arctic air spill south, but the process is slow. If cold does reach the surface, the likeliest window is late November into December, not right away. Thanksgiving in the US falls on November 26, so travelers are watching closely.
Europe may be more exposed than North America, though that remains uncertain.
The Super El Niño Twist
Here’s the complication. A likely record-strong El Niño is expected to heavily influence the weather pattern all winter. A Super El Niño could offset some of the cooling a disrupted vortex sends into the US. The result may be a winter with both warm and cold extremes.
Don’t Panic Yet
Forecasters are urging caution. An early SSW doesn’t necessarily decide the weather for the whole winter. And there’s no confirmed widespread flight or rail disruption tied to this event.
Cold snaps also happen without any vortex trouble. Cold air can and does plunge into the US and Europe without hiccups in the polar vortex.
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