More than 450 flights were canceled at O'Hare Airport Tuesday night as hail and torrential rainfall hit the Chicago area.
Along with cancellations, some flights were delayed as long as 90 minutes.
At Midway, there were some delays of 30 minutes and minor cancellations, the city's Department
of Aviation said.
On NBC Chicago's Facebook page, one commenter reported hail near O'Hare.
Travelers should be in touch with their airline or check FlyChicago.com before heading to the airport.
With all the rain comes the threat of localized flooding. Runoff from that water will cause urban and small streams across the greater Chicago area, the weather service said.
In Saint Charles, 0.99 inches of rain was measured in less than 20 minutes. And in Schaumburg, a spotter recorded .88 inches of hail. Dime-sized hail was also spotted in Naperville near Hobson Road.
Wednesday will be drier, but still cold. The high will hit 45 degrees, while the low will dip to a chilly 32 degrees.