What is a polar vortex and how does it work? When “polar vortex” appears in the news, it can refer to one of two different, but related, weather patterns.

Extreme heat warnings stretched from Windsor to Timmins; humidex values climbed to the mid-40s. In Toronto, panic over ...

A study published Monday in the Proceedings of the National Academy of Sciences found that increases in salinity in seawater ...

A massive and surprising change is unfolding around Antarctica. Scientists have discovered that the Southern Ocean is getting saltier, and sea ice is melting at record speed, enough to match the size ...

CALIFORNIA — The four-person civilian Fram2 mission returned home in a splash down off the coast of California on Friday after being the first humans to orbit Earth's polar regions. Riding in ...

A striking 2015 satellite image has captured a rare meteorological phenomenon known as von Kármán vortices swirling off ...