A polar vortex dipping down from Siberia will bring a cold front with frigid temperatures to nearly 300 million Americans.

Extreme cold could expose residents of several states to conditions like hypothermia and frostbite over the weekend.

Another Arctic blast has been forecast to bring frigid air to a large section of the United States later in January.

New research reveals the Arctic is changing fast as permafrost regions are warming, forests are stressed, and flooding is ...

The Arctic is of increasing strategic importance for homeland security and power projection, yet these missions are challenged by the region’s harsh environments and climates, food insecurity, and ...