Weather Grounds, Delays Flights This Holiday Weekend

Cold air and storms sweep across the country.
3:11 | 11/30/14

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Transcript for Weather Grounds, Delays Flights This Holiday Weekend
And millions of Americans making their way home this Thanksgiving weekend crowding the highways and the skies. Take a look at this map. There's a dizzying amount of flights in the air on this busy day of travel. 182 flights canceled. More than 2600 delayed. Dense fog in Denver diverting dozens of flights. Those planes landing an hour away. The lines forever enter trouble on the roads as well. Wayne in California caught the hazards and traffic James like this one in Los Angeles. David Kerley from Reagan airport in Washington. This is the security line for the airport. Reporter: Americans are on the move tonight. More than 2.6 million travelers packing airports. As Chicago's midway, security lines looping thru the terminal. Denise Whitaker from out Seattle affiliate KOMO facing this mile long line on her way home. I've been at the airport a total of seven hours. It took us about an hour and 15 minutes to get through that long security line. Reporter: At New York's JFK airport a security scare, a bomb threat against this American airlines flight arriving from Barcelona, Spain. The flight was met by law enforcement and 200 on board evacuated to the tarmac. When we landed they told us to stay seated. They told us to keep out baggage still and to stay seated and not to move. It got kind of alarming when you saw the men in the bomb disposal outfits. They're all dressed in silver. It was like it was out of the space movie. Reporter: No explosives were found. Across the country 180 flight canceled, more than 2600 delayed. An arctic blast bringing biting winds to the midwest. And plunging temperatures to Denver where low visibility caused delays and forced airlines to divert incoming flights. Western storms bringing much needed rain, but with the good, the bad. In San Francisco, delays in the sky on the roads. Officials warning drivers to slow down. 90% of people traveling this holiday season are driving. Many hoping to be home tonight. The problem at the Chicago o'hare airport was a Tsu staffing issue and it just snowballed. There were not enough officers. And Wednesday, half the delays. Tom, amazing. Lack of nor'easter makes it easier to get home from the holidays. David, thank you. ABC's senior meteorologist rob Marciano is here. Rob, David was talking about the rain out in California. But that's actually a good thing, right? Yes, they need the rain. It's the driest period on record. But they need the rain. But too much is too good. And one, the area they got burned by wildfires, that are worried about mud slides. And also that are sandbagging across flood prone areas. We have a break in the rain tomorrow but it comes in earnest Tuesday. And three, four, five inches of rain and 2 and 3 inches as far south as San Diego. And there is serious cold on the way? Another cold shot. Take a look at this. People will see a 70-degree that in South Dakota. And Amarillo, my news 1. Okay. Thank you. The possible that ray rice

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

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