These two pics. from the Chicago water intake show how conditions change with these lake-effect snow bands.
The National Weather Service says a weather system will be rolling through the Chicago area until sunset on Monday. High drive times are being reported across the board, as well as a number of accidents.
Could be significant amounts of snow for the morning commute. The Lake Effect snow could continue through the night, into Porter County where a band is expected late Tuesday evening and will continue overnight. All Lake-effect Warnings/Advisories in northeast IL will be discontinued as of 4PM this Tuesday afternoon.
As of 7 a.m. Tuesday, O'Hare had gotten 4.9 inches of snow in 24 hours, Seeley said.
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Follow the snow progression on the Current Metro Weather Radar Mosaic below. Before Monday, the last snowfall greater than an inch during this unseasonably warm winter occurred on December 17 when 1.7 inches accumulated in Chicago. Visibilities vary greatly and can drop to zero within minutes. Travel is highly discouraged, according to the National Weather Service. The wind has been NNE, so the wind off the lake has been bringing the lake-effect bands in SE Wisconsin, NE Illinois and also off Lake Huron into E. MI. In the present situation, however, northeast winds are directing snow across the Chicago area, with snow working southward into Tuesday morning, then finally arriving in northwest Indiana. That band moved into northern Cook County by 4:45 a.m., and another band was expected to form somewhere in the area later in the morning. Snow accumulations will likely range between four to seven inches across western La Porte county, including Wanatah, Westerville, and Michigan City; and one to four inches in eastern and far southwest portions of La Porte county.
Lake Michigan's lake-effect snows, therefore, usually fall in northwest in and southwestern Michigan.
In looking ahead, Wednesday's risks could include a Limited Excessive Cold Risk and Limited Snow Risk.