The Ryan tornado was a bitch. As bad as Parkersburg 2008 or Barneveld Wisconsin 1984 (sirens in Madison infamously caused a Quiet Riot concert at the old Dane County Coliseum to be delayed)
The Dubuque tornado you are referring to was September 9, 1970, the week of my birthday. It damaged the trailer park you mentioned, the Drive In you mentioned, Hempstead High School and Kennedy Mall. A seventeen year old boy trying to clear tree branches off the roof of the Gulf gas station onDodge Street stepped on a concealed live power line and was electrocuted. Power was out for seventy two hours and I feared the sirens the rest of my childhood.
More recently, the UW Platteville campus was hit in June 2014 on the opening night of Jeff Gard's basketball camp. I had a child attendeng. Coach Gard and his staff of players deserve much credit for calmly taking emergency measures. One camper was pretty spooked when the window shattered in his fifth floor room in Rountree Commons and a bicycle flew in.