Overview
- The National Weather Service warns of narrow lake-effect bands capable of 2–3 inches of snow per hour and localized foot-plus totals along Lake Michigan, with the harshest impacts focused late Sunday into Monday morning.
- Winter Storm Warnings cover Chicago and Northwest Indiana through Monday, with forecasters cautioning of near-whiteout conditions, thundersnow, and extremely hazardous travel during the Monday commute.
- Freeze watches and warnings stretch across inland parts of the South, including portions of Florida, Louisiana and Mississippi, with lows near or below freezing Monday night into Tuesday and advice to protect plants, pets and pipes.
- Lake-effect snow and squalls will affect parts of the Great Lakes, including northern Ohio, northern Michigan, Door County and the Upper Peninsula, with shifting bands producing sharp gradients in snowfall through Tuesday.
- Transportation disruptions have already begun, including a Sunday ground delay at Chicago O’Hare, though temperatures are expected to rebound into the 50s–70s in many regions by Wednesday to Friday.