Chicago is preparing for a period of lake-effect chills, expected to bring colder temperatures as cold air moves over the warmer waters of Lake Michigan. This phenomenon results in increased cloud cover and cooler conditions. Residents should anticipate a drop in temperatures, with potential for brisk winds exacerbating the chill. The National Weather Service notes these conditions are typical for this time of year during the transition from fall to winter. While no severe weather warnings are in effect, the cooler temperatures may affect daily activities and outdoor plans.