US: Dense fog in Chicago grounds flights on Christmas Eve

More than 160 flights out of Chicago’s two international airports were canceled Tuesday morning because of heavy fog, disrupting plans for Christmas Eve travellers. O’Hare International reported 91 canceled flights as of 1:30 pm local time, with average delays of more than half an hour, and Midway International reported 71 cancellations. A ground stop for arriving flights into Chicago was in effect from about 5:30 am until 9:30 am, said a spokesman for the FAA. The National Weather Service issued a dense fog advisory over the Chicago area early Tuesday, saying that the conditions could reduce visibility to a quarter mile or less. The advisory has since expired. The FAA also briefly issued a ground stop for flights arriving at Phoenix Sky Harbor International Tuesday morning because of low cloud cover. <br/>
NY Times
https://www.nytimes.com/2019/12/24/us/chicago-airport-delays.html?searchResultPosition=6
12/24/19