The warning issued for McHenry County expired at 5:45 a.m., with hail and gusty wind threats.
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A ground stop was issued for flights arriving at O'Hare airport about 7:15 a.m. due to weather.
By about 11:45 a.m., average delays at O'Hare were about 40 minutes, and 34 flights had been canceled.
Average delays at Midway were about 30 minutes, as well, at one point.
Departures were eventually grounded, as well.
The ground stop was lifted about 9:15 a.m.
The BMW Championship in Olympia Fields was also delayed, due to the storms.
Gates and parking lots were expected to open at 10 a.m.
The storms exited the region about 10 a.m.
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There could be a few lingering showers in the later morning or early afternoon, but windy conditions will prevail Thursday afternoon, ABC7 Chicago meteorologist Tracy Butler said.
At 4 p.m., a beach hazard statement will be in effect in Indiana.