File Photo | Photo: Dave Briggs / Flickr (Creative Commons)

The National Weather Service has issued a winter weather advisory warning that up to four inches of snow are possible Friday in Lake and McHenry counties.

The National Weather Service (NWS) issued the advisory Thursday afternoon.

The advisory, which goes into effect at 3 a.m. Friday, includes Lake, McHenry, Boone and Winnebago counties.

Two weather systems will bring precipitation to the area. The first system will spread rain and wet snow eastward late Thursday into Friday.

Heavy and wet snow is possible starting from 3 a.m. Friday to around 1 p.m. Friday.

Total snow accumulations could range from 2-4 inches, the NWS said.

Forecasters say motorists should plan on sharply reduced visibility and slippery travel due to slushy snow accumulations.

The hazardous conditions will likely impact portions of the morning commute.

Temperatures are expected to warm above freezing through the late morning and afternoon.

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The second weather system will bring mainly rain Saturday afternoon.

The latest road conditions for Illinois are published online by the Illinois Department of Transportation at