I suppose if you didn't bury it deep enough in your back yard, the tornado could pick it up and toss it. So then the question is what severity of events do you

I suppose if you didn't bury it deep enough in your back yard, the tornado could pick it up and toss it. So then the question is what severity of events do you want to prepare for? Once-in-a-decade events? Once-in-a-century events? Or once-in-a-millenium events?