"Arctic Blast and Snowfall Predictions Sweep Across Midwest Cities"

Chicago is bracing for two waves of winter weather, with the first bringing snow showers over the weekend and the second, an "uncertain" system, potentially arriving early next week with varying predictions of snow and rain. The first wave is expected to result in 1-2 inches of snow, mainly affecting southern counties and parts of Northwest Indiana. The second system's impact remains unclear, with forecast models showing a wide range of possible outcomes, from significant snow accumulation to mostly rain. The National Weather Service emphasizes substantial uncertainties in the forecast, and temperatures are expected to drop into the 20s by the second weekend in January.