Joplin High School
On May 22, 2011, a tornado that killed 161 people in Joplin extensively damaged the high school and Franklin Tech. The high school's graduation ceremonies had just taken place about three miles away on the Missouri Southern State University campus shortly before the tornado struck.
According to principal Kerry Sachetta, "You see pictures of World War II, the devastation and all that with the bombing. That's really what it looked like. I couldn't even make out the side of the building. It was total devastation in my view. I just couldn't believe what I saw." In the weeks after the tornado, it was determined that the campus was irreparable and would need to be completely rebuilt. 
Planning for a temporary school began four days after the May 22 tornado. School officials announced in June 2011 that juniors and seniors in the 2011-12 class (and possibly later) would attend classes in a section of Northpark Mall. Classes began in the renovated former Shopko location as scheduled on August 17, 2011.
Tornadoes of 1973
Notable scientific milestones toward understanding the life cycle of tornadoes occurred in Oklahoma on May 24, 1973, when researchers exploited primitive Doppler weather radar, then under development by the National Severe Storms Laboratory (NSSL), to examine a tornado vortex signature, or TVS, for the first time in history. The scientists, in one of the earliest successful cases of storm chasing, were able to study the evolution of a violent tornado near Union City, and to generate clear visual photography of its entire life cycle, from birth to decay. The successful deployment of Doppler radar to detect tornado formation also pointed the way to the development of a nationwide Doppler radar system, and helped precipitate funding for studies on tornadogenesis.
At the beginning of the year, one of the strongest El Niño episodes since 1950, as defined by sea surface temperatures, was in progress but gradually diminishing, according to the Oceanic Niño Index (ONI). Peak trimonthly anomalies, measured in moving averages, were +1.7 °C above normal for the period December–February 1972 – 1973. The month of January featured clusters of tornado activity along the Gulf Coast, primarily in Texas and Louisiana, as well as part of the Florida peninsula—a pattern not inconsistent with that of El Niño winters in general. The deadliest and strongest tornado of the month was an F3 that struck Caldwell Parish, Louisiana, on January 18, killing one person and injuring two others. It was part of a larger outbreak on the same date that spawned five other significant tornadoes near the Gulf Coast, with 20 total injuries. A smaller outbreak affected Central Florida ten days later, causing damaging F2 tornadoes in the Campbell–Orlando area, with 24 injuries. February featured much less activity, with 10 confirmed tornadoes compared to 33 in January, and no destructive or deadly tornadoes occurred. Outside the U.S., a catastrophic tornado, believed to be an F5, ravaged a small town in Argentina on January 10, causing more than 50 deaths.