Forecast ahead of busy post-holiday travel

Major storm moving east could bring flash flooding, heavy snow and strong winds.
2:29 | 12/26/19

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Transcript for Forecast ahead of busy post-holiday travel
holiday, and now that post-christmas travel rush is under way. Millions of Americans are heading home, and you're looking at Chicago's o'hare international airport, and some are already there, but this is the calm before the storm. There's a new storm moving across the nation. It's posing a threat to millions of folks hitting the road this morning, trying to get home. Rob Marciano checking the latest for us. How tricky will this be for us? Out west, and it will be all be heading east. We have back to back storms. This is the first one heading west toward Utah, and then in the four corners region there, a highway spinout, and a small accident. I-40 and Arizona at the higher elevations seeing this drive on Christmas night. So a dicey, dicey drive there. We have a number of weather watches and advisories that are posted for this next storm that's coming, and winter storm watches now east of Denver into parts of northern Nebraska. Winter advisories for los Angeles, and much of southern California. Winter storm warnings now posted outside San Diego, and up to 30 inches of snow. The grapevine on I-5, shut down, and that's about five feet, and snow and heavy rain. This is a compact storm rolling through California, and will go through the mountain west tomorrow, and into the plains on look at Chicago, St. Louis, Little Rock looking for heavy rain here, and a lot of warmth building up. We'll see storms heading towards the weekend. Back to you. Thank you. We'll check on the travel situation with Alex Perez from o'hare airport for a balmy Chicago. Reporter: Hey, T.J. It's felt more like spring here rather than winter. This is the warmest Christmas we have had since 1982. Now I want you to take a look behind me here, the scene at o'hare. You see the terminal busy with passengers checking in for their flights. Today and tomorrow are expected to be some of the busiest travel days this holiday season. Nearly 3 million passengers are expected to fly. T.J.? Some folks are going to hit the road. What are the roads going to look like? Reporter: The roads will be busy especially today, and especially this afternoon and this evening. It could take some drivers up to twice as long to get to their destination than it usually takes later this evening, so in some places it's not going to be pretty. T.J.? Appreciate your honesty there. Alex, thank you so much.

This transcript has been automatically generated and may not be 100% accurate.

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