kim klockow mcclain: tornadoes consist of anything the tornado brings into the air.of dust and dirt and plants, branches. and then if it's a more violent tornado, that can include debris like planks of wood, shards of glass. mason lillard: i hear my grandma. lage, lage. and i was like, mama, i hear him. he was outside of the truck. it wasn't like a, i'm here, or i'm ok. it was moaning. storm chaser: oh, no. there are the lines. oh my god. oh my god. look at that. harold brooks: one of the things about a tornado is that it's producing a lot of small pieces of debris that are flying at, you know, 150 miles an hour. and even ordinary objects, dinner plates, two by fours, become really, really deadly at those kinds of high speeds. jim riek: i knew after joplin how destructive a tornado could be. it was moving so slowly that it was like a blender. everything on the ground was getting totally mixed together. and it just hits you again and again and again and again. i saw a piece of cardboard that actually penetrated into the exterior insulation finish system on a school. a