Our former home in Cincinnati was in the path of the deadly F-4 Montgomery-Blue Ash tornado. Most people did not hear the sirens. There was no roaring train sound.
For our part, we thought we were experiencing only a bad thunderstorm. So we went to the basement and listened to what we thought was hail hitting our house. It was actually debris.
The point is that you can't predict the behavior of a tornado. You can't count on city officials to always predict that behavior and set off the sirens. The best lesson we learned through this experience is that it is important to take responsibility for yourself.
You can do that by purchasing a weather alert radio that will keep you informed of immediate weather changes and patterns, warning you when it is advised to take cover.