The advisory is in effect from 6 p.m. Monday to 9 a.m. Tuesday for Cook, DeKalb, DuPage, Kane and Lee counties.
The advisory extends from 6 p.m. Monday to 4 p.m. Tuesday for Boone; Lake; McHenry; Ogle; Winnebago counties. Snow is expected to linger longer in the northern suburbs.
An Ice Storm Warning is in effect for DeKalb, Kane, Kendall and La Salle counties until 9 a.m. Tuesday.
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The advisory went into effect at 4 p.m. for Will, Kendall, Grundy and northwest Indiana counties and will extend until 4 a.m. Tuesday.
A Winter Storm Watch was issued for southern Wisconsin counties and northwest Illinois counties.
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Precipitation began at about 4 p.m. as rain and then turned into freezing rain and snow depending on temperatures throughout the area. Some may get freezing rain while others get snow.
However, it’s the ice that will cause problems for travel. Freezing rain left sidewalks all over the city deceivingly slippery. Salt trucks made constant rounds on the roads, but the difference between melted think layers of ice and remaining slick spots could be hard to spot.
In Naperville, commuters got off the train at the Route 59 station only to find their parked cars caked in a layer of ice.
Scrapers and salt trucks will remain in rotation overnight to prepare for the morning commute.
About 1 to 3.5 inches of snow are expected throughout the area, with the heaviest conditions in the northern suburbs bringing upwards of 6 inches of snow. Mostly rain will fall in the south suburbs.
The mix rain, snow and ice caused some problems for Chicago airports. As of 9:45 p.m. O’Hare International Airport reported 256 cancellations and delays averaging 30 minutes, while Midway International Airport reported 78 cancellations and delays averaging 28 minutes.
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