Learn in the textbookOnline Government Procedures, the Number System, and Disaster-Prevention Information
DefinitionJ-Alert (Jアラート) is the nationwide instantaneous alert system (全国瞬時警報システム) that relays national emergency information, such as ballistic missile warnings and earthquake early warnings, to residents in an instant through various channels.
ExplanationInformation sent by the national government via satellite and other links automatically activates municipal disaster-prevention administrative radio (防災行政無線; radio equipment local governments use to broadcast to residents) and similar systems. Because no time is spent waiting for staff to operate the equipment, warnings of danger go out sooner.
Memory hookThe J stands for Japan. Split the formal name, nationwide instantaneous alert system, into its three parts, and the role reads straight off the words.