Snow accumulation is expected throughout the day Wednesday into Wednesday evening in the Chicagoland area. | Graphic via NWS

The National Weather Service has upgraded Lake and McHenry counties to a winter weather advisory ahead of possibly several inches of snowfall Wednesday.

A hazardous weather outlook was issued by the National Weather Service (NWS) Tuesday morning for much of northeastern Illinois.

A winter weather advisory was also issued for areas near and south of Interstate 80.

The NWS then issued a winter weather advisory this afternoon for the entire area in effect at 3 a.m. Wednesday.

The alerts said snow will move into the area late Tuesday evening.

The snow will continue into Wednesday morning and through the day on Wednesday.

Lake effect snow could persist into Wednesday evening but the greatest travel impacts will occur in the morning, including during the Wednesday morning commute, the NWS said.

Lake County and McHenry County could see one to three inches on the northern half of the two counties and two to four inches on the southern half of the counties.

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The snow will be on the heavier and wetter side, the NWS said.

Peak snowfall rates of a half-inch an hour on Wednesday morning is possible.

Snow showers will continue Thursday and Friday with the potential for patchy accumulations and slick travel.

Temperatures in the single digits with sub-zero wind chills are possible early next week, the NWS said.