Nearly 600 Flights Delayed Or Cancelled In Chicago Due To Fog

CHICAGO, IL — All inbound flights were grounded Tuesday morning at O'Hare and Midway airports as dense fog blanketed the area. A dense fog advisory was in effect until 10 a.m. for Cook, Boone, DuPage, Kane, McHenry and Winnebago counties.

The Federal Aviation Administration grounded incoming flights at both airports through 8 a.m. Although the advisory was allowed to expire at Midway, it continued at O'Hare past 8 a.m., the Chicago Tribune reported.

The ground stoppage, or halting of all incoming flights, meant that not all departing flights left on time, potentially causing travelers to miss connecting flights, according to the Tribune.

According to FlightAware, 71 flights had been canceled at Midway and 22 were delayed as of just before 1 p.m. At O'Hare, 410 flights were delayed and 85 were canceled.

In addition to the dense fog advisory, a freezing fog advisory was in effect until 10 a.m. for DeKalb, Grundy, Kendall, La Salle, Lake and Will counties.

Unseasonably mild weather was expected for Christmas Eve and Christmas Day throughout the Chicago area.