The Federal Aviation Administration (FAA) issued a ground stop on August 11, 2026, for flights headed to Chicago O’Hare International Airport (ORD) and Midway Airport in response to severe storms. The ground stop at O’Hare lasted until 11:15 a.m. Central Time, while Midway’s ground stop remained in effect until at least 11:30 a.m. local time before being lifted. Following the ground stop at O’Hare, a ground delay program continued until 10 p.m. local time to manage air traffic flow.
Severe Storms Bringing High Winds and Flooding Threats
A line of intense storms impacted the Chicago metropolitan area, including Illinois and Indiana, prompting the FAA to take precautionary air
traffic measures. The storms generated wind gusts reaching 100 mph, produced brief tornadoes, heavy rainfall, and caused downed trees and power lines. Flood warnings were issued for the region during the severe weather.
The National Weather Service (NWS) issued a Hazardous Weather Outlook for the Chicago O’Hare area covering August 11 and 12, warning of likely thunderstorms and flooding. Rainfall between 0.75 and 1 inch was forecasted for the night of August 11 with a 100% chance of precipitation. On August 12, showers and thunderstorms were expected to persist with an 80% likelihood of precipitation.
July 27 Storms Caused Extensive Disruption at O’Hare
Earlier in the week, on
July 27, the Chicago O’Hare hub experienced significant storm-related disruption. Thunderstorms forced the cancellation of over 1,000 flights at ORD and resulted in average delays of 438 minutes. That day, the FAA issued ground stops at five major U.S. airports due to weather and staffing challenges.
Subsequently, on July 28, ground stops affected multiple airports including Newark Liberty International Airport (EWR), John F. Kennedy International Airport (JFK), and LaGuardia Airport (LGA), with the FAA ordering flight halts at 13 airports nationwide. FlightAware data from July 31 reported only one cancellation and 28 delays at ORD as weather risk persisted.
Travel Delays and Control Tower Evacuation at Midway
The
ground stops issued today halted departures to O’Hare and Midway, causing delays and cancellations. Additionally, the Chicago Department of Aviation confirmed that Midway Airport’s control tower was briefly evacuated due to the storms, interrupting operations temporarily.
With the ground delay program active at O’Hare through 10 p.m., arrivals and departures at the busy hub could face extended wait times as air traffic management adapts to the weather conditions.
ORD’s Capacity Constraints Amplify Weather Impact
Chicago O’Hare operates close to full capacity, making it particularly vulnerable to cascading flight delays during severe weather events. System-impacting conditions combined with high operational demand result in protracted delays for flights
arriving and departing the airport.
Earlier in July, severe weather caused widespread cancellations and delays at O’Hare, illustrating the airport’s susceptibility to disruption under adverse meteorological conditions.
Ground Stops at Multiple Airports Highlight National Weather Impact
The FAA’s ground stops at O’Hare and Midway on August 11 follow earlier weather-related disruptions at other U.S. hubs in late July. The agency coordinated ground stops at five major airports on July 27 and imposed flight halts at 13 airports including Newark, JFK, and LaGuardia on July 28. These actions aim to manage air traffic safely amid bad weather and staffing challenges across the country.
