UPDATE II: Video of the tornado here.
UPDATE: Tuesday morning. Quite a bit of damage resulted from these storms including six injuries when a tornado rolled a school bus near Rockford, IL. Flights were delayed more than five hours at O'Hare International Airport.
|Photo by Rockford Register-Star|
Tornado watch for the Chicago airports until 6pm Central. There is a ground stop at both O'Hare and Midway at the present time.
Radar at 3:55pm shows the thunderstorms to the west of O'Hare and Midwest (location indicated by white dots) with the storms moving east northeast at 60 mph. There will be additional delays this evening.
If you are changing planes in Chicago this evening, check into re-routing. For example, if you are on United going from Oklahoma City to D.C., see if you can re-route through Denver.
Additional updates at AccuWeather.