A couple years ago, the way tornado sirens worked around here changed. I don't know if it's just my state or if it was the entire country, but it changed.
Before, when a tornado siren went off, it was a tornado warning. Tornado warning meant there was a minimum of a funnel cloud hovering in the sky. However, now the sirens go off when we have a thunderstorm warning and a tornado watch. They say this means conditions are favorable for a tornado.
What this really does is a modern day version of crying wolf. When I hear a tornado siren, I want it to mean I have to run for my life. I don't want a "maybe."
Yesterday our sirens went off, we were all sitting up stairs, and our first move was to just turn the TV on because it was probably just a watch with a thunderstorm warning. It took us ten minutes to figure out that it was actually a tornado warning (meaning a likely % for tornadoes, and not actually a funnel cloud anymore).
Good thing there wasn't a tornado, because we would have died sitting up stairs trying to figure out what the siren meant.