NWS also has issued a Wind Chill Warning starting at 3 a.m. Monday and running through 9 a.m. Wednesday.
Winter Weather AdvisorySnow will begin falling early Sunday morning across much of Northern Illinois. Accumulations of 2 to 4 inches are expected further north of a band stretching from Dixon to Kankakee, and 3 to 5 inches of snow could fall further south of that line.
The first band of snow will end by mid-morning Sunday, and snow showers will return late Sunday afternoon and evening, adding possibly another one inch of snow.
Winds blowing west to northwest will increase to 20 to 30 mph with gusts up to 40 mph possible Sunday afternoon and evening.
NWS warns the snow and wind will combine to create slippery roads. Blowing and drifting of snow is likely and could result in blizzard-like conditions, especially in rural areas. Travel will be hazardous.
WIND CHILL WARNINGStarting at 3 a.m. Monday, wind chill values could reach -35 to -45 degrees, according to the National Weather Service. Temperatures will be so cold that hypothermia and frost bite could occur in a matter of minutes.
A wind chill warning means the wind will combine with the very cold air to create dangerously low wind chill values.