Emergency communication system
161 people were killed and at least 990 injured when an EF5 multiple-vortex tornado hit Joplin, Missouri. Because Joplin is located in a tornado-heavy area of the country, many people considered the tornado sirens routine and ignored them. Instead, many residents waited until they received confirmation from another, non-routine, source, such as seeing the tornado, a radio or TV report, or hearing a second siren. In the aftermath, an assessment team recommended that emergency warnings take risk perception into account to convey a sense of urgency. NOAA Officials are considering ways to change the warning system to distinguish smaller tornadoes from more deadly ones.
2011 Joplin tornado
As the tornado tracked eastward, it maintained EF5 strength as it crossed Main Street between 20th and 26th Streets. It heavily damaged every business along that stretch and several institutional buildings were virtually destroyed. It tracked just south of downtown, narrowly missing it. Entire neighborhoods were leveled in this area with some more homes swept away, and trees were stripped completely of their bark. At some residences, reinforced concrete porches were deformed, or in some cases completely torn away. Damage to driveways was noted at some residences as well. Numerous vehicles were tossed up to several blocks away from the residences where they originated, and a few homeowners never located their vehicles. A large church, Greenbriar Nursing Home, Franklin Technology Center, St. Mary's Catholic Church and School, and Joplin High School were all destroyed along this corridor. The Greenbriar Nursing Home was completely leveled, with 21 fatalities occurring there alone. As the tornado crossed Connecticut Ave further to the east, it destroyed several large apartment buildings, a Dillon's grocery store, and a bank. Only the concrete vault remained at the bank, and a wooden 2x4 was found speared completely through a concrete curb at one location as well. No one was in the high school at the time; the high school graduation ceremonies held about to the north at Missouri Southern State University had concluded shortly before the storm. Pieces of cardboard were found embedded sideways into stucco walls that remained standing at Joplin High School. Steel beams and pieces of fencing were deeply embedded into the ground in fields near the high school as well, steel fence posts were bent to the ground in opposite directions, and a school bus was thrown into a nearby bus garage. The tornado then approached Range Line Road, the main commercial strip in the eastern part of Joplin, affecting additional neighborhoods along 20th Street.