Sudden Stratospheric Warming Event - "A sudden stratospheric warming (SSW) is an event where the polar vortex of westerly winds in the winter hemisphere slows down or even reverses direction over the course of a few days. The change is accompanied by a rise of stratospheric temperature by several tens of kelvins.Typically stratospheric meteorologists classify the vortex breakdown into three categories: major, minor, and final." - Wikipedia
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