CHICAGO — Weather sirens in city and suburban communities across the Chicago area blared Wednesday evening as strong thunderstorms triggered tornado warnings in Cook and DuPage counties. At least one tornado was confirmed as having touched down near O’Hare International Airport, according to the National Weather Service. The poor weather briefly grounded all flights at O’Hare and Midway airports, according to the Federal Aviation Administration. While the weather service hadn’t confirmed any other tornadoes, fire officials in Elgin were on the scene of a suspected tornado touchdown that damage...