Polar vortex could bring 'nasty' weather to Ontario

Polar vortex slides into Ontario this weekend bringing a big temperature tumble

Arctic air over Western Canada has sent temperatures plunging. What you need to know about the polar vortex

Environment Canada extends extreme cold warming

How does a polar vortex happen in an era of global warming? - Quora

What is the polar vortex, and how does it contribute to cold snaps?

More Evidence That Arctic Warming Is Behind the Weak Polar Vortex, Smart News

snowfall - Best Weather, Inc

The Polar Vortex pays a visit

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

Polar Vortex to bring colder, more stormy weather to Toronto this month

El Niño winter starts mild across Canada; Will it turn wild?

Rochester NY Weather: How will polar vortex, bomb cyclone impact us?

How the polar vortex could deliver one last blast of wintry weather - The Washington Post

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

2019 polar vortex: Here's how the brutal cold impacted the U.S.