Weather Alarm, Seriously?

Ok, I've been in Dallas since 2005, the rest of my life was spent in Florida. Since I've been in Texas, I've heard about 4 of those emergency sirens blaring across the city for tornado warnings or whatever, none of which lasted more than 30-40 minutes. Now, I'm not saying tornadoes are not dangerous, maybe it's for the folks out in the rural area, but I've sat through loads of hurricanes and never heard an emergency siren in Florida, what's up with that. I know the weather moves fast out here but I would think people have common sense to look at the sky and tell that it's about to get rough outside, but I guess not huh? Just sayin....