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Arctic warming

The polar jet stream carries weather around the Northern Hemisphere. Climate researcher Jenifer Francis believes the rapidly warming Arctic is slowing and warping the jet stream, allowing Arctic air to spill farther south in some places.

How the warming Arctic might be behind Boston’s deep freeze

Science

There may be a counterintuitive explanation for the deep freeze that hit New England this winter: The rapidly warming Arctic is causing big disruptions in the jet stream, which carries weather across North America. Is this the worst winter you’ve experienced?