In my town they go off for EVERYTHING. Every thunderstorm warning, they go off. It's not uncommon.for them to go off four or five times a night during a storm. So, people being to ignore them. I know do.
The other night we were supposed to get bad storms. The sirens went off twice. I woke up both times and checked it out, and it was for thunderstorm warnings. Third time it went off I just rolled over and went back to sleep. Guess what? There was a tornado less than 5 miles away.
I think its dangerous and stupid to sound the alarms all the time. They don't alert people anymore. One of these days people are going to hurt in a storm because they ignored the siren because its already went off three or four times over nothing.