Winter Weather Advisory in effect until 1PM CDT Sunday for glazing from freezing rain and sleet in Winnebago, Boone, McHenry and Lake Counties in northeastern Illinois
A Winter Weather Advisory (purple-shaded area on highlighted map) has been issued for Winnebago, Boone, McHenry and Lake Counties in Illinois this Saturday evening, as temperatures have dropped to around 32-degrees and the wintry mix of freezing rain, sleet and snow in southern Wisconsin has slipped south into the adjacent Illinois counties. With precipitation expected to continue overnight into Sunday morning, an inch or so of snow and sleet and a tenth-inch of glaze from freezing rain could develop across these counties – the Advisory extends until 1PM CDT Sunday.
Slippery roads, sidewalks and paved surfaces will make for very difficult travel and greatly complicate any outdoor activities in affected areas. Conditions deteriorate even more, the farther north you go into Wisconsin.
Low pressure moving out of Iowa will pass overhead Sunday with colder air changing precipitation over to wet snow, so the Advisory may have to be extended or reissued later Sunday.