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More than 2,400 flights were canceled across the U.S. as a "bomb cyclone" that was threatening to make holiday travel a nightmare began fulfilling that threat on Thursday.

Gary Hershorn | Getty Images

Air travel, train, and bus services were disrupted due to the winter storm. More than 2200 flights had been canceled for Friday and Saturday.

By 9 pm, 9,300 flights had been delayed. The time is Thursday. Chicago and Denver were the hardest hit. There is a CNN story.

At one point Thursday at Chicago's O'Hare International Airport, delays averaging 159 minutes – almost three hours – were being caused by snow and ice, according to a notice from the Federal Aviation Administration.

Temperatures at the O'Hare dropped to 5 degrees Fahrenheit (-15 Celsius) around 6:45 p.m. local time. Light snow and fog/mist were reported by the National Weather Service.

The massive weather system's unusual characteristics were illustrated by a national weather service.

The cold front has arrived in Cheyenne and it is already a record-breaker! From 1:05 to 1:35, the temperature plunged from 43 to 3 degrees, a FOURTY-DEGREE drop in just 30 minutes! This shatters our previous 1-hour temp drop record of 37 degrees, and we are still dropping! #wywx pic.twitter.com/twQcNgy9qx

— NWS Cheyenne (@NWSCheyenne) December 21, 2022

The temperature dropped in just 30 minutes.

Major cities where bus service was disrupted include Chicago, Cleveland, Dallas, Denver, and Detroit. A number of Midwest and Northeast routes have been canceled or delayed.

In anticipation of the storm, major northeastern airports were preparing for similar delays Thursday night. Travelers are asked to confirm flight status with their airline.

The storm is expected to leave on Christmas Day.

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