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The polar vortex, made up of high winds that circulate around the globe every winter, stayed largely in the Arctic last year. But in 2021 the winds have weakenedThis allows cold air to escape from the polar regions. An arctic air explosion is now set to hit much of the US, beginning later this week.

“The entire Midwest is covered by this swaying polar vortex,” said Jeff Weber, a research meteorologist at . “That comes air …

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