captions paid for by nbc-universal television good evening. it s become something of a modern day cliche, after a disaster in this case, the collapse of that massive stage and a bad storm at the indiana state fair, people like us come on the air and ask questions like could it have been prevented? organizers, first responders, victims families will all be asking themselves that question for years to come. the truth is the national weather is so good and forecasting has become so accurate, bad weather seldom arrives these days without warning. but dealing with big crowds and a big venue is something else. and now the people of indiana are dealing with a massive tragedy and a lot of questions after a beautiful summer night at a great state fair was blown away and five people are dead. we begin tonight with nbc s ron mott in indianapolis. ron, good evening. reporter: investigators will try to pinpoint what part of this stage structure failed leading to saturday s dramatic c