Over the next 10 days, scientists say, changes in the stratosphere will upend weather patterns and set the stage for a cold, snowy December across parts of the Northern Hemisphere.

This winter could be average, unlike recent years, due to the influence of the polar vortex. Donald Trump’s White House ...

NBC 5 Storm Team Meteorologist Kevin Jeanes took a look at what’s going on and what the weather may look like going into ...

A rare polar vortex disruption will bring chillier temps this December. The sudden Stratospheric Warming Event will trigger cold air south, with areas like the Rocky Mountains and Central Plains set ...