The Federal Aviation Administration (FAA) implemented ground stops on August 11, 2026, affecting flights arriving and departing at Chicago O’Hare International Airport (ORD) and Chicago Midway International Airport (MDW) due to severe thunderstorms producing destructive wind gusts and heavy rainfall.
The National Weather Service issued a Hazardous Weather Outlook warning thunderstorms and potential flooding in the Chicago O’Hare area on July 31 and August 1. On August 11, wind gusts reached up to 100 mph across Illinois and Indiana, impacting the Chicago metropolitan region. Rainfall during the storm triggered flood warnings, while trees and power lines fell in the affected
areas.
The FAA ground stop at O’Hare, initiated as the storm advanced, remained in effect until 11:15 a.m. Central Time and could be extended depending on storm conditions. Midway Airport’s ground stop lasted until at least 11:30 a.m. After the stoppage lifted at O’Hare, a ground delay program remained active, restricting departures until 10 p.m. that day to manage air traffic safely amid ongoing weather concerns.
The Chicago Department of Aviation confirmed the Midway control tower was briefly evacuated during the storm, temporarily impacting airport operations. Passengers at both O’Hare and Midway faced delays and disruptions ensuing from the FAA’s
precautionary measures and adverse weather.
Earlier severe weather also disrupted flights at O’Hare, with over 1,000 cancellations recorded on July 27, 2026—the highest nationwide that day. FAA data reported an average delay time of 438 minutes during ground delay programs on that date, underlining the severe operational impact of storms at this busy hub.
The National Weather Service stated there were chances of thunderstorms with some potentially reaching severe levels southwest of a line from Rochelle to Kankakee. Heavy rainfall was expected to produce localized flooding near Chicago O’Hare on July 31 and August 1.
Airports operating near capacity like
Chicago O’Hare are particularly vulnerable to major weather-related disruptions. The combination of severe weather with high air traffic demand causes prolonged delays, as observed from past incidents. In 2022, Chicago O’Hare reported over 5,000 weather-related flight delays exceeding 15 minutes, reflecting the airport’s susceptibility to storm-induced disruptions.
