The National Weather Service (NWS) issued a Hazardous Weather Outlook for the Chicago O’Hare International Airport (ORD) area on July 31 and August 1, 2026, warning of thunderstorms and flooding risks. Heavy rain and severe weather were forecasted to affect flights at ORD during this period.
Earlier, on Monday, July 27, 2026, the FAA recorded a major disruption at O’Hare caused by severe thunderstorms. More than 1,000 flights were canceled, and the FAA reported an average ground delay of 438 minutes at the airport.
FAA Ground Stops at O’Hare and Midway Airports on August 11
On Tuesday, August 11, 2026, the FAA issued ground stops for both Chicago O’Hare International Airport
and Chicago Midway International Airport (MDW) due to a dangerous line of storms impacting the Chicago metropolitan area. The ground stop at ORD was set to last until 11:15 a.m. Central Time with the possibility of extension, while Midway’s ground stop was maintained until at least 11:30 a.m. CT.
The Chicago Department of Aviation confirmed the Midway control tower was briefly evacuated during the storm event, affecting airport operations temporarily.
Traveler Delays and Operational Impact
Following the ground stops, the FAA implemented a ground delay program at O’Hare airport that will continue until 10 p.m. CT on August 11, 2026. Flight arrivals and departures at
both airports experienced delays and cancellations as a result of these restrictions.
At 6 a.m. Eastern Standard Time on July 31, 2026, data showed one cancellation and 28 delays at O’Hare, representing 2% of departures, amid forecasts of continuing severe storms and flooding.
Severe Weather in Chicago Metro Area
The storm system moving across Illinois and Indiana included wind gusts reaching 100 mph, brief tornadoes, downed trees, power lines, and flood warnings as reported by the National Weather Service and local news sources. These conditions prompted the FAA’s preventative actions.
Weather-Related Delays at Major U.S. Hubs
Chicago O’Hare and Midway airports are among several major U.S. hubs susceptible to significant weather delays.
In 2022, Chicago area airports recorded over 5,000 weather-related delays exceeding 15 minutes. Other hubs like New York area airports and Boston Logan experienced higher cumulative weather delays.
Severe weather impacts at these busy airports are intensified by limited excess capacity, often causing flight delays of several hours due to congestion and scheduling constraints during adverse conditions.
