The cold temperatures are coming from a not uncommon expansion in the Polar Vortex, which are counter-clockwise rotating air currents that typically hang over the Arctic.

Here's the latest on the winter storm. A historic winter storm is poised to produce potentially record-breaking snows from coastal Texas to northern Florida late Monday into Tuesday. The event comes as an Arctic blast affects more than half the U.

Snow totals were rivalling all-time records. Officials were urging residents to take precautions and stay off roads.

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

Abnormal weather events and severe winter storms could be caused by a disrupted polar vortex. Find out here how the polar vortex affects the weather.

NEW ORLEANS (AP) — The vast majority of Americans are about to get an extended taste of frigid Siberian weather. Another polar vortex disruption will stretch Arctic air across the top of the globe and make Donald Trump's second inauguration the coldest in 40 years, meteorologists said.

People living "basically anywhere from the Rockies eastward" will see extremely cold temperatures over the next several days, a meteorologist says.

A winter storm sweeping through the U.S. South on Tuesday was dumping snow at levels millions of residents haven’t seen before

A winter storm that is expected to begin in Texas next week could end up bringing snow and ice to parts of Florida, but the forecast is far from a lock.

People in Texas and much of the U.S. South are facing record snowfalls and icy conditions, with both New Orleans and Houston covered in snow. The big picture: This once-in-a-generation event for millions across the Gulf Coast has closed schools,

A major storm could drop significant amounts of snow, ice pellets, and freezing rain across the U.S. Deep South through Tuesday