Outagamie County, Wisconsin, noon every Saturday, year round. The siren on the building behind by apartment building included.
:-)
BTW, increasingly rare nowadays, when those Federal 1000-T Thunderbolt sirens with the 4/5 impellers went off, THAT was a tornado warning! They scared the bejeevers out of me when I was a kid, but today I realize that that was an amazing sound.
Mike