As a practical matter, this kind of event is a reminder that a "Bug-Out Bag" can just as easily become a Bug-In Bag, grabbed as you head to the basement or root cellar. Too, it's a reminder to ensure your emergency supplies are stored in as safe and secure manner as possible -- and that you should be planning what you'd do if you had to do without.If your idea of preparedness is an SKS, a case of ammo, and a colander to strap on your face, then you're gonna be Sierra Oscar Lima when one of these real-life disasters comes along. After all, you can't shoot a flood. (Well, you can, but like voting Libertarian, while it may make you feel better, it's probably not going to do much good.)
Remember: So far this year over 500 people in the US have been killed by tornadoes, while there hasn't been a single confirmed zombie bite.