Transcript for Severe Weather Blamed for Deadly Tent Collapse
of that deadly tent collapse. Gio Benitez is on the scene right now. Good morning, gio. Reporter: Yeah, good morning to you. Look at this mess behind me. Crews are trying to clean this up right now. These storms moving in hard and fast killing a father of two. Reporter: Overnight extreme weather creating havoc throughout Illinois, garages completely torn down and streets destroyed. And at this superben Chicago music festival a horrifying scene. High wind and heavy hail uprooting a tent collapsing over the crowd. Chaos. A man had got struck by one of the large poles. These must be 30, 40 feet tall and he was laying right next to it. Reporter: Ambulances and medics rushing to the scene. 15 people taken to the hospital. 35-year-old Steven ninsec killed. This is horrible. It started hailing and then started pouring and then before you knew it the pole went up and over. Nearby another devastating collapse. A sports dome that once looked like this completely destroyed. Nearby, this remarkable scene, thousands of concertgoers from another Chicago music festival lollapalooza evacuated and taken to the streets after severe thunderstorm warnings. Look at the size of that he things. Golf ball sized hail pelting lake Michigan. Beachgoers fleeing the shore as the storm rolls in. Oh, my god. We got to get inside. Reporter: In Iowa, a damaging tornado hitting hard. People frantic I searching for safety. Oh, man. Let's get into the bathroom here. Wow, look at that. Reporter: An incredible view of the tornado destroying the ground below. Oh, my god. Reporter: And back here live just outside Chicago, a tiny bit of good news. Luckily this all happened during the band's sound check which means there were less people here at this summer festival potentially saving lives, Amy. Thanks for that.
This transcript has been automatically generated and may not be 100% accurate.