A winter storm in Houston this weekend brings the threat of freezing temperatures, dangerous wind chills and icy road conditions. See the latest weather forecast, timeline, impacts, warnings and live coverage.

Much of the nation east of the Rocky Mountains is hunkered down for what could be the worst winter storm of the season, followed by some of the coldest temperatures seen in years.

More than 122 million Americans are expected to travel at least 50 miles for Christmas and New Year's holidays this year.