A mass of Arctic air from Canada is bringing brutally cold temperatures to the northeastern United States. Vermont is under Extreme Cold Warnings, with wind chills expected to reach 20 to 40 below ...

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The polar vortex collapsed, and severe temperatures are set to dominate most of the country in the coming days. Single-digit temperatures are forecast for much of the Northeast, and subzero ...

As the Great Lakes region braces for a predicted near-record cold this weekend, Michiganians are again cursing the dreaded "polar vortex." But what exactly is this meteorological menace? And why is it ...

Extremely cold air is going to take over Michigan, as the center of the Polar Vortex drops far south. The center of this swirling vortex will come as far south as Lake Superior. When the center of the ...

A polar vortex is expected to bring two surges of extremely cold air to the U.S. in January. The polar vertex is a large area of low pressure and cold air that sits over Earth's poles. Middle ...

Update — If you’ve been waiting for a "classic" winter wallop, this weekend looks like it will finally deliver. A winter storm is going to develop on Friday in the southern Plains and track east, with ...

This story has been edited to correct an error. Judah Cohen is affiliated with the Massachusetts Institute of Technology. Our old wintertime friend the polar vortex ...