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.
1881 Minnesota tornado outbreak
The 1881 Minnesota tornado outbreak was a deadly tornado outbreak that struck southern Minnesota on July 15–16, 1881. At least six tornadoes touched down between 2:00 pm – 6:00 pm CST, killing 24 people and injuring at least 123. The deadliest tornado of the outbreak, an F4 that killed 20 people in and near New Ulm, was likely a tornado family that may have caused F5 damage to rural farmsteads. Six people died in New Ulm, where people from nearby settlements had congregated to avoid Native American attacks.