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.
Tornado outbreak sequence of June 3–11, 2008
A strong jet stream moved northeast across the Great Plains region and a strong surface low in western Kansas strengthened as it moved to the Nebraska-South Dakota border. Ahead of the low, very warm and moist air spread throughout the South Central United States into Nebraska, eastern sections of South Dakota and the upper Mississippi Valley. The combination of strong winds and warm and moist air created conditions favorable for strong thunderstorms. On June 5, a high risk of severe weather was issued for six different states in the Midwestern United States, with a moderate risk area surrounding the high risk area. Forecasters had warned of a potentially historic outbreak, as computer forecasting models for June 5 resembled those on June 8, 1974, when 39 tornadoes struck the southern Great Plains and killed 22 people. Wichita State University canceled evening classes because of the weather predictions. Severe weather began developing across eastern Colorado and northwestern Kansas during the morning and into the early afternoon, producing several weak tornadoes in the process. An EF1 tornado impacted a campground near Kellogg, Iowa and injured two people. Despite extremely favorable conditions, severe weather for the day was limited and the tornadoes generally caused minimal damage.