CHICAGO (AP) — A winter storm that is expected to produce a mix of rain and snow has prompted airlines to cancel more than 250 flights at Chicago's O'Hare International Airport and 140 at Midway International Airport.

By Tuesday afternoon, the airlines at O'Hare reported delays between 15 minutes and 45 minutes on both inbound and outbound flights. The city's aviation department is urging travelers to check their airlines' website for flight status.

Forecasters expect the storm to leave behind three to six inches of snow.