Tornado outbreak sequence of May 21–26, 2011
The tornado outbreak sequence of May 21–26, 2011 was one of the largest tornado outbreaks on record which affected the Midwestern and Southern regions of the United States. Most of the tornadoes developed in a corridor from Lake Superior southwest to central Texas; isolated tornadoes occurred in other areas. An especially destructive tornado destroyed one-third of Joplin, Missouri, resulting in 158 deaths and over 1,000 injuries. The Joplin tornado is the deadliest in the U.S. since April 9, 1947, when an intense tornado killed 181 in the Woodward, Oklahoma area. Tornado-related deaths also occurred in Arkansas, Kansas, Minnesota, and Oklahoma. Overall, the tornado outbreak resulted in 184 deaths, 6 of those non-tornadic, making it second only to the 2011 Super Outbreak as the deadliest since 1974, and the second costliest tornado outbreak in U.S. history behind that same April 2011 outbreak, with insured damage estimated at $4–7 billion.
List of tornado-related deaths at schools
More tornadoes with deaths in schools have occurred in the Southeastern United States—23 events or over half the national total—than any other region. Four of the top ten death toll events occurred in the Southeast. Relatively few school fatality tornado events have occurred in the area with the highest frequency of strong tornadoes, the Great Plains (Tornado Alley); only a single event occurred after warnings began being issued. This is probably chiefly due to three reasons: the low population density, greater tornado awareness (and better visibility affording more warning), and the time of year and of day that most tornadoes strike the Great Plains.
The state with the most tornado deaths throughout history is Illinois, with 90. The largest school death toll from a tornado was 69 during the Tri-State Tornado, which also struck Illinois and significantly raised that state's death toll. The greatest death toll at a single school also occurred during the Tri-State tornado, when it killed 33 at a school in De Soto, also in Illinois. This tornado also injured hundreds more at schools, and killed many students returning home from schools. Additionally, three of the top ten events by death toll, and four if separate schools of the same tornado are counted (33 in De Soto and 25 in Murphysboro again from the Tri-State Tornado), have occurred in Illinois.