Highways in DeKalb County and a stretch of Interstate 80 in Bureau County were mostly covered by a glaze of ice early Saturday evening, the winter road conditions map from the Illinois Department of Transportation indicated.
But other northern Illinois highways were affected by the icy drizzle that fell late Saturday afternoon. The same IDOT map showed roads partly covered by ice in Ogle, Lee, Putnam, La Salle, Grundy, Livingston, Kane, Kendall and Will counties.
On Saturday afternoon, freezing rain affected roads in the Quad Cities and a triangular section of central Illinois between Springfield, Normal and Champaign.
The IDOT twitter feed showed traffic slowed by conditions on southbound I-57 near Effingham. It posted a photo from the cab of a plow show an ice-covered section of U.S. Route 45 in Champaign County. About 4 p.m. IDOT reported that the right lane of northbound I-57 was blocked at Exit 238, which is the I-72 interchange.
The NWS for the Quad Cities issued an urgent winter-weather message at 7:17 p.m. Saturday saying an advisory was in effect until midnight for north central and northwest Illinois, including Carroll, Whiteside, Bureau, and Putnam counties.
Likewise, the NWS for Chicago had issued an earlier advisory about 1:36 p.m. Saturday calling for ice accumulations of up to one-tenth of an inch for Ogle, Lee, DeKalb, Kane, DuPage, La Salle, Kendall, Grundy, Kankakee, Livingston, Iroquois, Ford, Cook, and Will counties. It reported that accidents and slide offs were increasing on untreated icy roads.
Sunday will be sunny but blustery with temps in the low 20s. Sunday night there is a 30% chance of flurries. Temps could get as low as 1 degree.
Chance of snow increases Monday with daytime temps in the mid teens and subzero temps possible that evening.