I'm originally from a small farm town in Michigan that has an all volunteer fire department and 3 police officers.I remember the Canadian air raid sirens being tested when I was a kid in the 50’s
In the middle of the town there is a siren like this that goes off when there's a fire (steady tone) or a tornado warning (alternating high and low tones) and at 6pm every evening except Sunday. It's a mechanical siren with a rotating horn and we lived about a block away from it.