Snow is expected to begin late Thursday afternoon in northern Illinois and at least three inches are expected throughout the area. | Graphic via the National Weather Service

A winter weather advisory is set to go into effect this afternoon with 3-6 inches of snow possible in Lake and McHenry counties, the National Weather Service reported.

The advisory is set to go into effect at 3 p.m. Thursday in Lake, McHenry, Boone and Winnebago counties.

A winter weather advisory has already gone into effect for the rest of the Chicago area.

The advisory for Lake and McHenry counties will expire at 6 a.m. Friday.

The National Weather Service (NWS) said residents should plan on snow-covered roads and slippery road conditions.

The hazardous conditions will likely impact Thursday evening’s commute and possibly impact the start of the Friday morning commute.

Lake County is projected to get 4-6 inches of snow while McHenry County is projected to get 3-4 inches of snow, the NWS said.

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“Slow down and use caution while traveling,” the advisory said.

The latest road conditions for Illinois can be found online at