A fresh blast of Arctic air is poised to spill across a wide swath of the United States, and the latest polar vortex map ...

A chilling polar vortex is set to bring snow and ice to the South and East this week. We show where.

Major cities across the Northeast and Midwest are facing temperatures 10-20 degrees below average, according to forecasters.

Arctic air originates near the polar regions and is among the coldest air masses on Earth. It typically stays locked in ...

NORFOLK, Va. — Have you ever wondered why some winters are mild while others bring freezing temperatures and snowstorms? One of the key players in these dramatic shifts is something called the polar ...

Tom has a Master's degree in Journalism. His editorial work covers anything from archaeology and the environment to technology and culture. Tom has a Master's degree in Journalism. His editorial work ...

The jet stream, or any wind, is the result of differences in surface temperature. In simple terms, warm air rises, creating low pressure, and cold air sinks, creating high pressure. Wind is the ...

Add Yahoo as a preferred source to see more of our stories on Google. At the same time, every hurricane that formed, including the three powerful Category 5 storms, steered clear of the U.S. mainland.