Tornado sirens and prisoner escape sirens.
But we had those in Ohio as well, at least where I was. And I grew up with air raid sirens, it's kind of comforting to me. You know, I was 12 years old before I learned that it was not common to hear explosions in the background of your world. I guess that's what you get for living close to Aberdeen Proving Ground. It was an odd sort of revelation.