It’s really, really cold again – as the US shivers through at least the eighth blast of air from the Arctic this winter. Here’s why it keeps happening.

"It's been a really unusual year." Farmers sound the alarm after months of weird weather throws crops off track: 'We'll just ...

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One is a weather pattern around the Arctic Circle that ... But it hasn’t because the polar vortex has been frequently been stretching into weird shapes Cohen said. A strong polar vortex is ...