CHICAGO – Airlines canceled more than 230 flights at Chicago's O'Hare International Airport and nearly 50 more at Midway International Airport ahead of a winter storm that's expected to produce a mix of rain and snow.

Forecasters expect the storm to leave behind three to six inches of snow. The National Weather Service has issued a winter weather advisory from noon to 9 p.m. Tuesday for the Chicago area.

The Chicago Department of Aviation is advising travelers to check their airline's website for flight status.

Roads throughout central and northern Illinois grew slick and some schools and government offices closed.

The National Weather Service says some heavy snow piled up early Tuesday in west-central Illinois. Both Galesburg and Macomb had more than 5 inches on the ground.