i can see why you did this post now,i live in the "City's" and you folks got some really bad weather in the last few weeks.i don't know about a barrel shelter but you might want to ask around and see what the farmers up that way use.just off the top of my head i would say any cement culvert you can get into would work.storms pass over fast so laying down in one for a bit would be no big deal.
just noticed that was post 1000--i don't know if that's a sign of interest or boredom.