
The US is seeing an early winter cold snap. A persistent polar vortex drives Arctic air across the states causing freeze warnings, sub-zero temperatures, frost and snow.

US freeze warning: Polar vortex is driving down temperatures in central and northern America. Predictions, warnings

The polar vortex over Antarctica has elongated. NASA scientists explain why

Earth's polar vortex in Antarctica is set to tear apart. Here's how it will impact planet

Weather wrath:  Floods in Australia, Snow in US

How cold is the polar vortex? See for yourself

In pictures: Polar vortex descends on US Midwest, makes it colder than Antarctica

What is the polar vortex and why is it so cold?

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