Around 40 million people in the U.S. are under a winter storm warning from an unusual blast of severe winter weather.

Marylanders are bracing for the upcoming polar vortex, expected to bring temperatures into the single digits early this week.

There’s a chance of snow this weekend before temperatures are expected to drop to the single digits next week due to a blast ...

A blast of Arctic air is set to cover much of the United States with temperatures below freezing starting on Friday and into ...

Image: A polar vortex is driving the winter storm, which began to strike over the weekend and is passing through much of North America. Pic: NOAA / AP Maryland governor Wes Moore urged residents ...

The polar vortex of ultra-cold air usually spins around ... Classes were also canceled in Maryland, where Gov. Wes Moore declared a state of emergency Sunday and announced that state government ...

The plunging polar vortex is bringing subfreezing temperatures to some of the southernmost points of the U.S. A forming storm ...

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

The polar vortex of ultra-cold air usually spins around ... Brian Witte in Annapolis, Maryland; Julie Walker in New York; Joshua A. Bickel in Cincinnati; Jamie Stengle in Dallas; Jeff Martin ...