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What is the polar vortex?
Answering "What is the Polar Vortex"? As Canada Faces Coldest Air of the Season
The Polar Vortex, Explained
Polar Vortex explained in under 120 seconds
Polar Vortex - How it's formed & When it is dangerous | In-depth Explained
What is a polar vortex? Explaining the extreme cold set to grip parts of Canada
What is the Polar Vortex
Polar Vortex explained - why will it be so cold in the south?
What is a Polar Vortex?
What is the polar vortex? Frigid air plunges deep into the US
WHAT IS A POLAR VORTEX ? BBC NEWS
What Is A Polar Vortex?
