Freezing rain is the primary threat for Wednesday’s wintry mix storm in northern Illinois, the NWS said. | Graphic: NWS Chicago

The National Weather Service has issued an ice storm warning for McHenry County and a winter weather advisory for Lake County as a wintry mix moves into the area.

The National Weather Service (NWS) issued the ice storm warning in effect for 6 a.m. Wednesday to 6 a.m. Thursday.

The warning covers McHenry, Boone and Winnebago counties.

The NWS also issued a winter weather advisory in effect from 6 a.m. Wednesday to 6 a.m. Thursday covering Lake, Ogle, DeKalb and Kane counties.

Significant ice and sleet accumulations are expected Wednesday morning into the evening for Lake and McHenry counties.

Light freezing rain and drizzle will continue into Wednesday evening and Thursday morning in the two counties, the NWS said.

Total ice accumulations of two to three-tenths of an inch with higher possible near the state line, while total sleet accumulations up to one-half inch, the NWS said.

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Some parts of the Chicagoland area will possibly see thunderstorms and flooding.

Motorists should plan for slippery road conditions and downed tree branches resulting in power outages.

The hazardous conditions will likely impact the evening commute.

The NWS said travel is strongly discouraged and those who must travel should keep an extra flashlight, food and water in their vehicle in case of an emergency.

High winds, with gusts up to 40-45 mph, are expected Thursday.

The latest road conditions for Illinois can be found through the Illinois Department of Transportation at www.gettingaroundillinois.com.