Statement as of 5:25 AM January 16, 2012
...Wintry mix and snowfall possible late tonight and Tuesday...
With rising temperatures and an increase in moisture out ahead of an approaching surface low...light rain or drizzle...and fog will develop across much of northern Illinois and Northwest Indiana today. This surface low will then move east through the area tonight with an associated cold front ushering in much colder air...providing a transition to a wintry mix and then snow on Tuesday.
Current indications are that this light rain will transition to light freezing rain late tonight and early Tuesday morning for areas northwest of a line from La Salle to Chicago.
Although...this should be a brief window with no ice accumulation expected. A transition to all snow is then expected to occur through mid morning Tuesday for all areas in northern Illinois and Northwest Indiana. Before the snow ends Tuesday afternoon...a few inches of snow can be expected with locally higher amounts possible.
Details regarding freezing rain and snowfall potential will likely need further refinements and persons planning travel across the region late tonight and Tuesday should closely monitor later forecasts and statements.
More weather details online at www.wgfaradio.com