Timeline details overnight severe threat, including hail and strong winds

Chicago area faces a severe weather threat overnight Friday into Saturday, including hail up to an inch, 60 mph wind gusts, and localized flooding. The Storm Prediction Center issued 'slight' and 'marginal' risk levels, with O’Hare International Airport experiencing flight delays. Severe conditions are expected to peak between 3-6 a.m. south of Interstate 80.