Yes, Ottawa, it's a polar vortex again

By Tom Spears, Ottawa Citizen, December 27, 2017

You can now officially blame a polar vortex for Ottawa’s frigid temperatures.

But wait, what’s a polar vortex?

Most of Canada has a blanket of cold air that has pushed its way down from the Arctic, where it spends much of the year going around in circles (that’s the “vortex” part) and not bothering us at all.

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