| Why Sudden Warming? |
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| q | Planetary-scale waves
propagating from the |
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| troposphere (produced by big mountains) into the |
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| stratosphere. |
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| q | Those waves interact with
the polar vortex to |
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| break down the polar vortex. |
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| q | There are no big mountains
in the Southern |
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| Hemisphere to produce planetary-scale waves. |
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| q | No sudden warming in the
southern polar vortex. |
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