McHenry County is in a winter weather advisory until 10 a.m. today.
Light to moderate snow will impact motorists throughout the morning, as visibility will be reduced to less and a mile at times and snow may fall at rates of half an inch per hour, according to the National Weather Service.
The heaviest snow is expected to continue until 9 a.m., with lighter snow possible into the early part of the afternoon.
A total of two to three inches of snow is expected, with isolated amounts of up to four inches possible, the weather service said.
The slick roads have caused minor accidents throughout the county Wednesday morning, and motorists are encouraged to take caution when driving.