This blast of cold weather is due to activity of the polar vortex.

A series of disturbances in the atmosphere is sending the polar vortex south (again) next week with a burst of even colder ...

The most unusually cold air in the Northern Hemisphere will be over the United States early next week, bringing dangerously ...

A series of cold fronts the last few weeks has kept Florida downright chilly, as another winter storm starts to take aim this ...

NEW ORLEANS -- The vast majority of Americans are about to get an extended taste of frigid Siberian weather. Another polar ...

Abundant cloud cover and rain will keep overnight temperatures more mild, with lows in the 50s and 60s throughout Central ...

Here's how the polar vortex, and climate change, influence extremely cold winter weather in the US. Intense snowy wintry weather in the US has been fuelled by activity of the polar vortex ...

Residents across the country from the Northern Plains to the tip of Maine are bracing for dangerously low temperatures ...

FOX59 Meteorologist Ethan Rosuck provided an update on the dangerous cold Indianapolis could see at the start of the work week.