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.
Joplin, Missouri
On May 22, 2011, an EF5 tornado touched down near the western edge of the city among large, newer homes, about 5:21 pm CDT (22:34 UTC) and tracked eastward across the city and across Interstate 44 into rural portions of Lawrence County. Its track was reported to have been about in width and long. About 2,400 houses, 1,000 cars, and businesses were flattened or blown away in Joplin, particularly in the section between 13th and 32nd Streets across the southern part of the city. The tornado narrowly missed the downtown area.