At least 100 million Americans were under some level of winter storm warning, watch, or advisory on Thursday The winter storm is the biggest to hit Chicago on New Year’s Day since 1999. As of midnight Wednesday night, 5.1 inches had fallen at O’Hare International Airport. The northern suburbs were hit hardest, with 18 inches reported in Gurnee, 13.8 inches in Riverwoods, 13.7 inches in Mundelein, and 12.9 inches in Beach Park. Snow that started Tuesday continues to pile up Wednesday evening, grounding more than 600 flights at Chicago airports and leaving ...