CHICAGO (CBS) -- Outdoor warning sirens across Illinois will have their monthly test this Tuesday morning ... a storm would have caused confusion, as tornado warnings are their most frequent ...

No, tornadoes aren't in Chicago's weather forecast ... and one day after monthly siren tests, which take place on the first Tuesday of every month. The test is part of Severe Weather Preparedness ...

The National Weather Service said a tornado touched down near Chicago’s O’Hare International Airport on Wednesday, disrupting hundreds of flights. The storms damaged buildings, downed trees ...

The audible siren testing normally happens on the first Wednesday of every month, but previous tests have led to audible sirens sounding in parts of Linn County on Wednesdays the last two weeks.

The tornado sirens will sound again at 6:55 p.m. The Minneapolis dispatch center will activate the sirens countywide for the 6:55 p.m. test. “It’s important for you to review with your family ...