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.
Webster County, Missouri
On April 18, 1880, an intense tornado measuring F4 on the Fujita scale struck Marshfield. Its damage path was wide and long. The tornado killed 99 people and injured 100, and it is said that 10% of Marshfield's residents were killed and all but 15 of its buildings were destroyed. The composition “Marshfield Cyclone” by the African-American musician John W. (Blind) Boone gave wide publicity to the cyclone, which is still listed as one of the top ten natural disasters in the history of the nation.