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Polar vortex: What is it and how does it happen?

The deep freeze gripping much of the US has been blamed on a polar vortex. Here's what that means.

from BBC News - Home https://bbc.in/2Sex5LW

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very funny

Temperatures to hit 25C in burst of late September warmth

Temperatures are expected to rise well above the late September average on Tuesday with a very warm night to follow, as Simon King explains....