A cold front will move through northeast Illinois this afternoon, setting the stage for a significant drop-off in temperatures for the rest of the work week. Temperatures for the Tuesday-Friday period will average about 10 degrees below normal with the coldest day Friday when readings will probably fail to warm out of the 20s.
Light snow or flurries will be in the forecast almost daily, and with winds mostly on a northwest trajectory, heavy lake-effect snows around the south end of Lake Michigan and Northwest Indiana may develop, especially Tuesday and Friday.
Holiday travel to the northeast may be problematic, as the persistent upper air pattern dominating the eastern Northern Hemisphere responsible for our wintry chill here will impact western Pennsylvania and New York with heavy snows.
WGN-TV Chief Meteorologist Tom Skilling and the WGN Weather Center staff provide daily coverage of weather in the Chicago area.
