This happens when brutally cold air moves over relatively warmer water in Chicago, especially over Lake Michigan and the Chicago River. The water releases moisture into the air, and when that moisture hits freezing temperatures above the surface, it instantly condenses into visible fog, often called “lake smoke.” The bigger the temperature difference between the air and the water, the thicker the steaming effect appears. So when Chicago’s lake looks like it’s steaming, it’s not warmth you’re see

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