The National Weather Service has expanded the Winter Storm Watch late this afternoon to include all of northern Indiana, all of southern Wisconsin and most of southern Michigan.
In addition, the entire state of Illinois is also under a Winter Storm Watch for Monday night through Tuesday.
At 1:17PM this Sunday afternoon, the National Weather Service issued a Winter Storm Watch for late Monday night through Tuesday for all of Northern Illinois and portions of northwest Indiana.
Keep in mind that this is just a watch at this point, and not a warning.
A Winter Storm Watch means there is the potential for a significant snow or ice event, and the event is not imminent.
A Winter Storm Warning means a significant winter storm is occurring, imminent or likely.
Storm Details: Unlike some of our previous storms this season, it appears this will be exclusively a snow event. Freezing rain, sleet and rain are highly unlikely with this system in the Chicago area.
The first wave of accumulating snow is not expected until late Monday afternoon or Monday evening. It looks like we should get through the Monday morning and Monday evening rush periods in pretty good shape.
Below: The Winter Storm Watch area is outlined in yellow
The weekend will end on a quiet note, but trouble is brewing for early next week. For the very latest, follow the link below to the WGN Severe Weather Blog
A significant snow event looks like a real possibility across the entire Chicago area starting Monday night and lasting through most of Tuesday.
Two potent pieces of energy, one over North Dakota and a second over in Arizona, will be moving toward Chicago over the next 24 hours.
If these two systems “phase” together, or become one larger system, a major snow event of 6 to 14 inches is likely. If these systems do not “phase”, or remain relatively separate, we should still see for a good deal of snow with accumulations in the four to six inch range.
The WGN Weather Center Team will be monitoring this storm closely as it evolves over the next 24 hours. We should have a pretty good handle on just how these two systems will interact and impact our area (major vs minor storm) by late Sunday night or early Monday morning.
The latest computer model guidance into the WGN Weather Center on this Sunday morning continues to strongly suggest a significant snow event is possible starting on Monday night and lasting into Tuesday night.
Winter Storm Watches may be posted for part or all of the Chicago area later today. Check back with the WGN Severe Weather Blog for further updates throughout the day today or tune into CLTV for continuous local weather updates every 10 minutes.