The polar vortex is a large area of cold, spinning air that sits near the North Pole and exists year-round. When it weakens or shifts, Arctic air can spill south, increasing the risk of snow and ...

Add Yahoo as a preferred source to see more of our stories on Google. Dangerously cold temperatures are expected across a large portion of the U.S. this week, impacting the Midwest, Mid‑Atlantic and ...

Hang on to your coats and scarves: While the first part of this week brought a brief reprieve from the brutally cold weather the U.S. has been experiencing since January, frigid temperatures are about ...

A: A large upper-level low has shifted south over the Great Lakes allowing an unseasonably cool air mass to settle over the area. Generally speaking, as an air mass moves away from its source region, ...

A winter storm descending on the US is expected to deliver heavy snow and ice to more than 150 million people across roughly two dozen states. Forecasts predict the storm will plunge Texas into a deep ...

What is a polar vortex? That thing causing frigid temperatures this week is not a storm, but a pressure system that actually exists every day. Watch Rich Wirdzek's ...

The snow has melted, the air is warm, and the first day of spring 2026 is near, but don't pull out the swimsuit just yet, because "false spring" in New York will be disrupted by the polar vortex split ...

The stratospheric polar vortex is entering its seasonal collapse. But that doesn’t mean calm weather is coming. What's ...

As the polar vortex disappears every spring, the way it ends dictates why some years we don’t experience these mid-spring ...