WGN-TV Chief Meteorologist Tom Skilling and the WGN Weather Center staff provide daily coverage of weather in the Chicago area.

Messy, long-lived winter storm starts Wednesday

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Chicago has been dodging snow and ice storms since Thanksgiving, but that may all be ending soon. A powerful upper low that plagued California and the southern Rockies with snow and more flooding rain is taking aim on the Midwest. The eventual track of the heaviest snow is still in doubt as development of the attendant surface low does not appear until noon Wednesday. To further complicate matters, some of the considerable moisture with this system is above freezing, allowing sleet, freezing rain or even rain to mix in. If the storm stays all snow, city totals could exceed 8 inches, peaking in the overnight hours of Wednesday into Thursday. The storm could span 48 hours from late Tuesday until early Thursday. Thereafter, brisk northerly winds follow Thursday, with a slow warming each succeeding day—into the low 40s by next Monday.