Parts of northern Illinois could see heavy snowfall during a winter storm beginning Monday evening and ending late Tuesday, forecasters said. | Graphic: NWS Chicago

The National Weather Service has issued a winter storm advisory ahead of a two-round winter storm that could bring up to a foot of snow in some areas of northern Illinois.

The National Weather Service (NWS) said the two-round snow system will arrive in Illinois on Monday.

The NWS issued a winter weather advisory for Lake, McHenry, Kane, LaSalle, Boone, Winnebago, Ogle, Lee and DeKalb counties.

The advisory is in effect from 8 p.m. Monday until 6 a.m. Tuesday for McHenry, Boone, Winnebago, Ogle, Lee and DeKalb counties.

McHenry, Boone, Winnebago, Ogle, Lee and DeKalb counties should expect snow accumulations of 2-3 inches for the first round of snow.

The advisory for Lake, Kane and LaSalle counties is in effect from 8 p.m. Monday to 6 p.m. Tuesday.

Lake, Kane and LaSalle counties should expect total snow accumulations of 3-6 inches.

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The NWS also issued a winter storm watch specifically for McHenry, Boone, Winnebago, Ogle, Lee and DeKalb counties in effect from Tuesday morning through late Tuesday evening.

Additional snow accumulations for McHenry, Boone, Winnebago, Ogle, Lee and DeKalb counties could be in excess of six inches during the second round of snowfall, the NWS said.

Snowfall rates in excess of one inch per hour are possible at times late Tuesday morning into Tuesday evening.

Winds could gust as high as 30 mph across all of the counties. Motorists were advised that travel could be “very difficult.”

The hazardous conditions could impact the Tuesday morning and Tuesday evening commute, the NWS said.