Polar vortex could bring 'nasty' weather to Ontario

What is a polar vortex and what does it mean to state the 'polar vortex ' is collapsing and weakening? - Quora

Polar Vortex: Winter storms, bitter temperatures blast much of nation

Cold weather to pause as warmup looms in wake of polar vortex

Weakened polar vortex seen as likely culprit behind China's big chill

The Polar Vortex.winters coldest wrath

Northeast snow this weekend, a big, complex storm next week, and what's the deal with the polar vortex? – The Eyewall

Sudden stratospheric warming, polar vortex disruption could mean colder weather for eastern US

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Polar Vortex

Bone-chilling cold in the forecast for Toronto as Polar Vortex approaches

Workweek Outlook: Heading towards the polar vortex - Sault Ste. Marie News