That sort of thing is impossible to know.
There were no tornadoes in Sioux City on April 9, 2011. However, there was a cluster of 20 tornadoes to the east of Sioux City that occurred over the course of 4 hours. No single tornado lasted that long though. Durations of those tornadoes ranged from 2 minutes to 1 hour.
July of 2011 It will be called Forever.
Tornado Rampage 2011 - 2011 TV was released on: USA: 22 May 2011
There were no tornado-related deaths in Illinois in 2011.
Yes! August 20th 2011!! In the mágic Valley mall!! :)
There were no tornado-related deaths in Texas in 2011.
The cast of Sioux County Agriculture - 2011 includes: Andy Schuttinga as Himself - Host
Tornadoes are not given names as hurricanes are, but are often referred to by where and when they hit. Some of the most infamous tornadoes include The Joplin, Missouri tornado of May 22, 2011; the Moore, Oklahoma tornado of May 3, 1999; The Wichita Falls, Texas tornado of April 10, 1979; and the Worcester, Massachusetts tornado of June 9, 1953.
Both Oklahoma and Missouri suffered very destructive tornadoes in 2011. Missouri was hit the hardest because of the Joplin tornado but that state is not entirely in Tornado Alley. Overall, the worst tornado damage in 2011 was in Alabama, but that state is several hundred miles from Tornado Alley.
Tornado Alley - 2011 was released on: USA: 10 March 2011 (Museum of Science and Industry) (premiere)
The most devastating tornadoes are usually the ones rated F5 or EF5. Tornadoes of this intensity have been known to obliterate entire neighborhoods and kill dozens. Examples of especially devastating tornadoes of such intensity include the Moore, Oklahoma tornado of 1999 which killed 36; the Hackleburg, Alabama of 2011 which killed 72; and the Joplin, Missouri tornado of 2011 which killed 158. Occasionally an F4 or EF4 tornado makes it onto the list as well, such as the Wichita Falls, Texas tornado of 1979 which killed 42, and the Tuscaloosa, Alabama tornado of 2011, which killed 64.
Metal Tornado - 2011 TV is rated/received certificates of: USA:PG