First it was Thursday's slush and snow.
Then warmer temperatures pressing on snow covered spaces led to foggy conditions that worsened during the day on Friday.
A dense fog advisory went into effect for Grundy, Kendall, Kane, and DeKalb counties, including the cities of Morris, Coal City, and Minooka just before 3 p.m. on Friday, and will remain in effect until 9 p.m. Friday night, according to the Grundy County Emergency Management Agency.
Visibility is one-quarter mile or less with dense fog lingering, which will have an effect on commute times. Improvement is expected south of I-80 first, then moving into other areas.
Low visibility could cause dangerous driving conditions. Drivers are reminded to slow down and use their headlights.
Meanwhile, a winter weather advisory is in effect until 12 a.m. on Sunday, Jan. 26 in Grundy County, as well as LaSalle, Kendall, Kane, and DeKalb counties. Snow is expected with a period of moderate to heavy snowfalls through Friday night into Saturday, with potential isolated areas of snowfall as high as 6 inches. Snow is expected to taper off on Saturday afternoon