A winter weather advisory was issued ahead of snow accumulation expected overnight into Friday morning in the far northern Illinois counties. | Graphic via NWS

A winter weather advisory has now been issued for Lake County, in addition to McHenry County, ahead of the potential for several inches of snow on Friday.

The National Weather Service (NWS) issued a winter weather advisory early Thursday morning for McHenry, Winnebago and Boone counties.

The NWS updated the advisory to include Lake County on Thursday afternoon.

The advisory for all of the counties will go into effect at 1 a.m. Friday and expire at 4 p.m. Friday.

The NWS said wet snow is expected with total snow accumulations of one to five inches.

The highest snowfall is expected near the Illinois-Wisconsin state line and the lowest across southern portions of the counties.

Motorists are reminded to plan for slippery road conditions by slowing down and using caution while traveling, the advisory said.

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The hazardous conditions could significantly impact travel overnight into the Friday morning commute.

A heavy snow band is expected near or just north of the Illinois-Wisconsin state line, the advisory said.

If the band shifts south, “more significant impacts” would be expected in the four Illinois counties under the advisory.

The latest road conditions for Illinois can be found online at www.gettingaroundillinois.com.