A lot of people in storm zones are using those. Burying them halfway in the ground securing them to concrete footers and they are slap tornado PROOF. Pretty smart really.
too poor here for such, we just take a shovel and dig a hole big enough... called a scared'y hole!! LOL
but I have a lime sink half way down the hill... I tell her to head there... move the old pallets, scrap iron, tin cans, and whatever, and make a nest! if the tornado is catching up, ya just got to run faster!?????