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These polar vortex stretches are happening more frequently as the world — and especially the Arctic — warms, a 2021 paper published in the journal Science, also co-authored by Cohen, demonstrated.

The polar vortex was in play during the 2021 February freeze, which led to the failure of the statewide Texas power grid. Now the current state of the polar vortex is unusually strong.

“ Anytime we get an Arctic air blast down this far south, this is an artifact of the polar vortex rearing its ugly head,” said climatologist Barry Keim .

The polar vortex, a swirling mass of cold air located over the polar regions, is responsible for the cold.

In normal conditions, the polar vortex spins tightly over the Arctic, allowing the polar jet stream—which blows by beneath and south of the polar vortex—to remain fairly smooth.