Anyone from SW Iowa is probably familiar with KMA's tornado watch 2 tone somewhat comforting "beep" every minute or so (during songs, ballgames, whatever) and then the terrifying tornado warning pulsing high pitch sound.
I think they have been using that for at least 45-50 years now. As long as I've been alive.
I think they have been using that for at least 45-50 years now. As long as I've been alive.