Four to six inches to snow is expected to fall on McHenry County by Sunday morning.
The National Weather Service has issued a winter weather advisory from 3 p.m. Saturday until 9 a.m. Sunday for northern Illinois.
Snow will start Saturday afternoon and taper off by Sunday morning, according to NWS. The heaviest snowfall is expected Saturday evening.
Below-zero windchills also are expected Sunday and Monday mornings.