Two winter systems are coming together across the northern U.S. this week, bringing heavy snow, strong winds, and even the ...

Such events distort the polar vortex, which causes Arctic air to descend into the U.S. and causes temperatures to plummet.

Thundersnow that happens when thunder and lightning occur during snowfall. The rare weather event can be helpful for predicting a larger storm. Less than one percent of all snowstorms are associated ...

The polar vortex is about to weaken sharply, as part of a rare event called "sudden stratospheric warming." It's a big deal for weather around the country.

High above the North Pole, about 20 miles up in a layer of air called the stratosphere, something unusual is happening this winter. Temperatures there are rising very quickly. This is called a Sudden ...

A rare weather event known as "thundersnow" was captured on Feb. 29 in Montreal. Combining a unique mix of snow, lightning and thunder, the snow shower came just before a major storm hit the city.

Multiple yellow snow and ice warnings are in place across for vast swathes of the country with temperatures plunging well below zero for millions of Brits this week ...

A Sudden Stratospheric Warming is happening this winter, and it might have an effect on the temperatures and snow in Michigan ...