It is impossible to say what anyone would do until faced with the situation as a reality. Planning is the only pre-disaster action someone can take, and even that isn't foul proof.
This topic DOES remind me, though, that tornado season is here (I'm in KS). In fact, we've had some weak storms the last few nights, with strong storms predicted for tomorrow! It's time for me to update my tornado plan. Luckily, we have a basement. I need to get the extra crate moved downstairs, as well as the travel carrier(s). The human stuff needs to get done, too!! Water, snacks, candles, blankets, etc. etc. Tornadoes come up at any time; some warnings last minutes, sometimes we had "tornado days" when we are on watch constantly. Most of the time, tornadoes don't do a great deal of damage, but sometimes they do. Planning and preparation is the only defense against these disasters, even the ones you can't really predict with any amount of clear certainty.