Over 600 flights at Chicago's O'Hare and Midway airports have been canceled Thursday due to heavy snow and gusty winds in the area.
As of Thursday at 5:46 p.m., 445 flights were canceled at O'Hare and 161 at Midway, according to the Chicago Department of Aviation.
Average delays of more than an hour are being reported at O'Hare, while delays of 30 minutes are being reported at Midway.
A weather advisory was issued for Cook, DuPage, La Salle, Kendall, Kane and parts of Will counties from noon to 9 p.m. Thursday.
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The National Weather Service warned that roads will likely become slippery, while patchy blowing snow could reduce visibility, especially during evening commutes.
A winter storm warning remains in effect until 9 p.m. Thursday for Grundy, Kankakee, Livingston and parts of Will counties in Illinois, as well as Lake, Ford, Newton and Jasper counties in Indiana.
Some areas in Indiana could see "near white out conditions" at times, causing "extremely dangerous" travel conditions Thursday afternoon, officials warned.
The National Weather Service tweeted an update on the winter storm system hitting the Midwest Thursday, saying forecasts have now shifted to predict most snow will arrive south of Interstate 80 between 10 a.m. and 3 p.m.