I know from experience that tornado warnings are only issued the moment the weatherman spots the weird shapes on the doppler radar, which can sometimes be a few minutes after it's touched down and already knocking houses over. And even when they're issued, people don't take them nearly as seriously as they should, because they always seem to be somewhere else.
...until they're not.
That's what's so scary about tornadoes. You can tell when conditions are favorable for one, but they're impossible to predict otherwise. In fact, when my town got hit by one almost two years ago to the day, we didn't even get a take shelter warning come over the news or weather radio. It wasn't even mentioned until after it was gone.
Got you. But when we get those conditions here in Alberta (which is rare), I take them seriously. Having been in the Fire Services for several years, I have seen and dealt with the end result first hand. My wife and I have plans for just such an emergency. We have a sheltered area to go to with supplies and this is why I do not worry. It would take a nuke to destroy our shelter.
Preparedness takes away the scare for me. Earthquakes fall into this category as well. It is probably the unpredictability that scares people so much.