Winter '22 / '23 - Snowmageddon Weather in North America More Influenced by Tropics Than Arctic

"Winter weather patterns in North America are dictated by changes to the polar vortex winds high in the atmosphere, but the most significant cold snaps are more likely influenced by the tropics ..."

"The study, published in Geophysical Research Letters on December 27, 2019, also revealed that, unlike in Europe, the most extreme cold snaps affecting the whole of North America are not most likely to occur after a weak (polar) vortex. Instead, the shape of the vortex and conditions in the tropics were identified as stronger influences of these conditions"

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