The polar vortex — ultra-cold air spinning like a top — usually stays above the North Pole, but sometimes stretches down to the U.S., Europe or Asia, causing intense doses of cold.

A major winter storm began Saturday in the central U.S. and was forecast to move east over the next several days, producing heavy snow, significant ice and frigid temperatures, according to the National Weather Service.

While it may begin as a rain/sleet/snow mix, snow will overspread much of North Texas through the day and continue Thursday night. The snow may be heavy at times. Two to five inches is possible. Some locations may receive more than five inches of snow (especially farther north).

The winter storm will pull away from the St. Louis area this morning, taking the snow away with it. However, arctic air is coming in behind the storm on gusty northwest winds.

Another part of this cancer journey." Millions should prepare for disrupted travel and winter conditions as a fierce storm is set to bring ice, snow and freezing rain to much of the U.S. Sen. Adam Schiff,

Bitter cold is expected Monday morning, with wind chill values (feels-like temperatures) in the single digits and teens. A Cold Weather Advisory is in effect for North Texas, including Dallas and Fort Worth,

Arctic cold has settled in. We picked up a few flurries today and now all eyes are on a developing winter storm that will track across the southeast later in the week and may bring snow and ice accumulations to north Alabama.

Highs reach the upper teens to low 20s Monday afternoon under a sunny sky. North winds keep wind chills near zero through the day. South winds return Wednesday, allowing us