Climate deniers are quick to say ‘I told you so’ when the mercury drops. But a warmer planet impacts weather in ways that can seem counterintuitive. Record cold temperatures are once again expected to ...

The big winter (and popular) topic is dusted off very early this season as frigid air plunges south next weekend. But what is the polar vortex, exactly?

Deep penetration of cold temperatures and a coastal storm will bring bomb cyclone and polar vortex into your newsfeeds.

A polar vortex brings bitterly cold Arctic air into southern Ontario. Here’s what it is and what you can expect.

Winter Storm Fern aftermath continues as the East Coast braces for a bomb cyclone and polar vortex, with heavy snow and ...