Volanic activity
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Thanks for the great question! One thing we've noticed with this strong polar vortex is the lack of wave activity. As mentioned in a previous post, there's often wave activity that nudges the polar vortex. At the end of October and first half of November, wave activity was well below normal.
But it has also been noted that volcanic activity can influence the polar vortex. A great example is the Hunga Tonga eruption. There's also been some analysis on the Northern Hemisphere volcanic activity.