Compared to say, Oklahoma, Kansas, or other states in "Tornado Alley" , no, we don't get them as often. But they are very common here, and very violent. I've been fortunate to never have been hit by one personally, but have had some close calls. On August 28, 1980 Plainfield, Illinois had one of the worst tornado's ever recorded, in Illinois History. It's a town about 30 minutes from me. The tornado was on the ground for 16.4 miles! 27 people were killed, 350 injured and more than $140 million in property damage. There were four individual tornadoes spinning around one main storm. The Plainfield high school was destroyed. Miraculously classes weren't due to start until the next day!
Hopefully, the weather people have learned something. The tornado touched down just before 3:30 PM, and at 3:51 PM, after the death and destruction was over, the National Weather Service issued it's first tornado warning of the day. Prior to that announcement, only a severe thunderstorm warning was in place.
It hit my mom's cousin's place dead on. I went out there, the day after the tornado, and couldn't believe the destruction. I started crying like a baby. I guess, because I was so glad they weren't hurt, and because of all the destruction that was done. Fortunately, they weren't home at the time. Although severely damaged, their old farmhouse survived, but the barn and outbuildings were destroyed. They had to put long lag bolts in, from the outside of the house, to pull the rim joists back into the floor joists, because they had been pushed out by the wind.
I think the worst "material damage," that a tornado does, is to the trees. The ones that aren't blown over, stand there like an eerie statue. Their leaves are completely gone and have been replaced by parts of peoples houses and personal possessions from, God only knows, how many miles away.