Severe Weather Prompts Hundreds of Flight Cancellations at O’Hare Airport

U.S.|Severe storms prompt hundreds of flight cancellations at O’Hare Airport.

• Aug. 9, 2021, 10:40 p.m. ET

More than 300 flights were canceled at O’Hare International Airport in Chicago on Monday after severe weather prompted a ground stop and an evacuation of the airport’s control tower.

The National Weather Service had been tracking severe storms in Illinois throughout Monday afternoon and into the night. Around 7:17 p.m. local time, the Weather Service said a tornado had been confirmed on the ground in Arlington, Ill., about 100 miles southwest of Chicago.

About an hour later, the Weather Service issued a severe thunderstorm warning for areas north and northwest of Chicago, including O’Hare Airport. Winds up to 60 m.p.h., penny-size hail and a tornado were possible with storms moving in the area, the Weather Service said.

“We are currently monitoring strengthening rotation over O’Hare Airport,” the Weather Service said on Twitter, moments after the severe thunderstorm warning was issued

The threat of a possible tornado led to the evacuation of the O'Hare air traffic control tower, the F.A.A. said.

Those in the tower were evacuated at 7:22 p.m. and returned to the tower about 20 minutes later, while air traffic controllers in Elgin, Ill., took over, the agency said.

Thunderstorms and a possible tornado prompted a ground stop at the airport, according to the Federal Aviation Administration. Gate holds and taxi delays were up to 45 minutes and increasing, and arriving flights were being delayed an average of 2 hours and 56 minutes, according to the agency.

By 9 p.m. local time, 304 flights had been canceled at O’Hare on Monday, and 26 flights were canceled at Midway International Airport, according to the Chicago Department of Aviation. It was not immediately clear how many of those flights were canceled because of severe weather in the area.

Severe weather in the Chicago area also caused Monday night’s game between the Chicago Cubs and the Milwaukee Brewers to be postponed until Tuesday. The team asked fans who had already arrived at the ballpark to clear the seating bowl and seek shelter immediately.