Summer may end on a cooler note for parts of the U.S., with meteorologists suggesting that a weakened polar vortex could ...

According to climate scientists, record levels of Arctic ice in 2025 could increase cold spells in the United States and Europe.

A rare glimpse into the wintry conditions of the Mars north polar vortex has shown that temperatures inside the vortex are far colder than outside, and that the permanent darkness that winter brings ...

This difference drives a large low-pressure circulation, known as the polar vortex, that extends from the Earth's surface high into the atmosphere. When the vortex is strong, the enhanced jet stream ...

The polar vortex is beginning to stir, signaling the first signs of seasonal change. Here's when to expect the first frost in ...

The polar vortex is stirring up, bringing the earliest hints that the seasons are changing. When will Wisconsin see its first freeze?

Stratospheric warming high above Antarctica could cause the Southern Hemisphere’s polar vortex to weaken at an unusually fast pace over the coming weeks.

HOUSTON, Texas (KTRK) -- With this most recent freeze now behind us, many Houstonians are probably wondering if another freeze could impact them this winter. When it comes to freezes, forecasters ...

It's already a lot to endure frigid winter conditions, but what happens when we get an unwelcome visit from an even colder spell of air like a polar vortex? "A polar vortex is simply that: a vortex ...

From the polar vortex to sweltering summer heat, our team of forecasters gave every major city a weather-themed personality.