A polar vortex dipping down from Siberia is bringing a cold front with frigid temperatures to millions Americans. See maps of ...

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

A polar vortex is currently hitting the United States, with schools closed in many areas and at least four deaths caused by ...

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

Others didn’t see it that way. Though it had little scientific significance, the stunt infuriated other Arctic nations and kicked the international rush to map out claims to the seabed into high ...