Freezing rain, drizzle
File Photo | Photo: Sue Thompson (via Flickr – CC BY-ND 2.0)

The National Weather Service has issued a winter weather advisory to warn of a wintry mix that could cause icy conditions across northern Illinois on Monday and Tuesday.

The National Weather Service (NWS) issued the advisory for Lake, McHenry, Boone, Winnebago, DeKalb, Kane, Kendall, northern Cook, Lee and Ogle counties.

The advisory, which was issued Sunday afternoon, will go into effect at 5 a.m. Monday and set to expire at 9 a.m. Tuesday.

A wintry mix involving freezing rain is in the forecast for Monday afternoon into Monday evening.

Difficult travel conditions are possible due to icing, especially on untreated roads and elevated surfaces.

The hazardous conditions are likely to impact both the Monday evening and Tuesday morning commutes.

A wintry mix involving snow, rain and ice is expected Monday into Tuesday for the entire northeastern Illinois area. | Graphic via NWS Chicago

The advisory said the first round of precipitation will begin as a light snow and sleet mix early Monday morning before transitioning to a period of freezing drizzle in the afternoon.

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A second more impactful period of precipitation is expected Monday evening into Tuesday morning.

The second round will fall mainly in the form of freezing rain on Monday evening, the advisory said.

It could mix with or change to a period of wet snow into early Tuesday morning across northwestern parts of Illinois.

Total snow accumulations of up to one inch and ice accumulations of around one-tenth of an inch are possible, the advisory said.

While air temperatures will be warming to near freezing late Monday evening, subfreezing ground temperatures will continue to make for icy and very slick streets and sidewalks into Tuesday morning, the NWS warned.

Motorists are recommended to slow down and use caution while traveling. “A few” power outages are possible, the advisory added.