A major winter storm is set to spread heavy snow and damaging ice across a large portion of the United States over the coming days. Dangerously cold temperatures will only worsen the storm and increase its danger.

Winter storm live updates: More than 10,000 flights canceled as bitter cold blankets the U.S.

The storm is expected to sweep through much of the United States, leaving "extremely dangerous" conditions in its wake as it tracks eastwards from the High Plains and Rockies, the National Weather Ser...