CHICAGO (AP) -- High winds have knocked out power for tens of thousands of people and forced 150 flight cancellations at O'Hare International Airport.

ComEd spokesman Joe Trost says as of Sunday afternoon 48,000 customers still were without power and that at the peak of the storm 68,000 customers had no power.

The Chicago Aviation Department says delays are averaging 45 minutes at O'Hare. There were no reported cancellations at Midway and a few delays of around two hours.

Chicago officials say more than 488 downed trees and limbs have been reported, along with almost 60 traffic signals out.