Polar vortex returns its winter role

The polar vortex is strengthening over the Arctic early in the season, which can help contain cold Arctic air near the North Pole. While this indicates a potentially less extreme start to winter, forecasts suggest it could weaken later, particularly in January and February, possibly allowing colder air to move south. The development of a very strong El Niño this winter may influence atmospheric patterns and impact the intensity and distribution of cold weather across the Northern Hemisphere.

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