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2018 Hawaii false missile alert
The 2018 Hawaii false missile alert was an erroneous emergency warning sent on January 13, 2018, telling everyone in Hawaii a ballistic missile was inbound; the correction took 38 minutes.
Civil defense siren
A civil defense siren, also called an air raid siren or tornado siren, is a fixed outdoor siren governments use to warn the public of attack or natural hazards.
Emergency Alert System
The Emergency Alert System (EAS) is the United States' national broadcast alerting system, established in 1997 to relay emergency messages from federal, state, and local authorities to the public.
Emergency Broadcast System
The Emergency Broadcast System (EBS) was the United States' national emergency alerting system for radio and television from 1963 to the 1990s, established by President Kennedy.
Wireless Emergency Alerts
Wireless Emergency Alerts (WEA) are short emergency messages that US authorities broadcast to mobile phones in a targeted area, administered by FEMA and delivered over commercial mobile networks.