Other Chicago suburbs' siren activation protocols are as follows: Plainfield has 12 outdoor warning sirens activated manually by digital radio system.

The sirens in St. Louis were not activated ahead of a tornado last week. Sabrina Franza wanted to know about tornado siren activation protocols in Chicago and the suburbs.

The Highland Fire Department is still compiling maintenance reports on allegedly faulty tornado sirens during a March storm after some residents said they didn’t hear sirens at all.

The Highland Fire Department resumed testing their tornado sirens in April after a tornado tore through town in March, but whether it had been prior to that storm is doubtful.