Meteorologists warn that a stretched polar vortex could bring severe winter weather to much of the United States.

A dramatic blast of cold air may be coming for the United States in late January, courtesy of the polar vortex. Here's what ...

Jupiter and Saturn's different polar storms reveal clues about planet interiors: Saturn has harder bottom than Jupiter.

The Great Lakes lose their shield as an Arctic blast targets Ontario with the coldest weather of the year ...

Watch as a massive bowl of Arctic air is set to bring extreme, potentially record-breaking cold temperatures to parts of the ...

With the Northern Hemisphere well into the winter months, it may seem like temperatures are cold enough already. However, a deep freeze, thanks to the polar vortex dipping down from Siberia, is ...

It's only early November, but here comes the “polar express,” weeks ahead of schedule. A cold blast more typical of early December will stretch from the Northeast all the way down the Atlantic Coast ...

Environment Canada has issued weather warnings for most of Canada over a 'high or moderate impact level' cold blast that is ...

The phrase “historic polar vortex” evokes a country locked in ice from the Great Lakes to the Gulf, but the most reliable records show a patchwork of extreme outbreaks rather than a single, weeks-long ...