Winter Weather Advisory continued across the Chicago area until at least mid-afternoon

Update 2PM CST…

The Winter Weather Advisory is in effect for the entire Chicago area until mid-afternoon and may have to be extended through the evening commute in at least a portion of the area, even though light snow/snow showers are slowly diminishing from the west. As the center of low pressure moves out over Lake Michigan winds are picking up out of the west, gusting over 20 mph causing blowing/drifting of snow, especially on north-south highways/roads. Driving will continue to be difficult under these conditions the remainder of the afternoon into the evening.

Overnight another band of snow is expected to swing southeast out of Wisconsin into northeast Illinois and northwest Indiana, with an additional inch or so snow accumulation likely in Lake and Cook Counties in Illinois and Lake and Porter Counties in Indiana. The Winter Storm Watch for heavy lake-effect snow in Porter County, Indiana continues in effect Tuesday/Tuesday night.

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Update 6:45AM CST…

The Winter Weather Advisory continues in effect until noon CST Monday across northeast Illinois and northwest Indiana, which includes the entire Chicago area. Additional snow accumulation this morning will bring snowfall totals area-wide into the 3 to 5-inch range. The morning commute will be a slow-go with slick, snow-covered roads – if you’re traveling plan for dangerous driving conditions and delays.

The center of low pressure will track east along the Illinois-Wisconsin state line this morning, moving out over southern Lake Michigan this afternoon and then east through Lower Michigan tonight/Tuesday. Snow will continue along and ahead of the low pressure, gradually diminishing from the west as the associated cold front passes a given location and winds shift from south to west.

This evening/overnight another band of snow/snow showers will move southeast out of Wisconsin across our area with winds shifting to the northwest. An additional inch or so could fall with the most intense snowfall occurring in Lake and Cook (Chicago) Counties, Illinois. Tuesday northwest winds will generate lake-effect snows in northwest Indiana. A Winter Storm Watch is in effect for Porter County Indiana where several inches of additional snow could add up Tuesday into Tuesday night.

Cold Arctic-source air will follow into our area later this afternoon and overnight into Tuesday, but the coldest pocket will rotate around Chicago to the west and then south with wind chills in far west and far south areas Tuesday morning in the -10 to -20-degree range. Cloud cover will cut back on the effects of the cold air closer-in to Chicago with wind chills -5 to -10-degrees.

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CHICAGO — Accumulating snow will spread over northeast Illinois and northwest Indiana this Sunday evening, and is forecast to continue through Monday with additional snow showers likely Monday night into Tuesday.

Primary accumulations of 3 to 5 inches are expected later Sunday and into Monday morning with a slow, hazardous morning commute in store for those who work on Martin Luther King Day. Additional accumulations are possible here, especially north closer to the Illinois-Wisconsin state line and along the Illinois Lake Michigan shoreline (including Chicago) later Monday into early Tuesday.

Low pressure will swing southeast out of Minnesota passing through southern Wisconsin Monday and on east into Lower Michigan Monday night into Tuesday. To our north, heaviest snows of 4 to 6-inches-plus are expected to fall in Wisconsin with a backlash of additional lake-effect snows along the Wisconsin’s east Lake Michigan coastline and in northwest Indiana Monday night into Tuesday.

Follow the development of this long-duration storm system closely to pinpoints areas of heaviest snowfall in the next 24 to 48-hours.

The map below depicts Winter Weather Advisory areas in purple and Winter Storm Warnings in pink.