CHICAGO (AP) — Bruce Rauner's office says the Illinois governor has activated the State Incident Response Center after a winter storm dumped as much as 18 inches of snow on the northern tier of the state.

Early Monday the National Weather Service said 18.4 inches of snow had accumulated at Chicago's Midway International Airport after the Sunday storm. Schools were canceled in Chicago and across the metro area on Monday. So were federal court proceedings in downtown Chicago. Airlines at Midway and O'Hare International Airport canceled more than 1,600 flights as of Sunday night.

Rauner's office says he had a conference call about the storm on Sunday afternoon with state transportation, emergency management and law enforcement officials. He says officials are worried about forecast dropping temperatures as the storm moves out of the area.

Copyright 2015 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

More From WROK 1440 AM / 96.1 FM