What is the Polar Vortex?

What is the polar vortex?

Nasa Ozone Watch: Polar vortex facts

What is the Polar Vortex and how does it affect Central Pa.?

The polar vortex, facts and information

Understanding Climate Change and the Polar Vortex - Science

The Science Behind the Polar Vortex

What is the polar vortex? How it's responsible for dangerous cold

What is the polar vortex – and how is it linked to climate change

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