The Brief Thunderstorms caused ground stops at O’Hare and Midway airports early Friday morning, halting landings and departures for several hours. The restrictions were lifted at 8 a.m., but a new ground stop at O’Hare lasted until 9:30 a.m. Ground stops were issued for several hours at O'Hare and Midway airports Friday morning due to weather. The ground stops were in effect for O'Hare and Midway until 8 a.m., when they were officially lifted. A new ground stop went into effect at O'Hare at 8:13 a.m. until 9:30 a.m.