emergency alert; critical alert; emergency warning
alarm (fire, burglar, railroad-crossing, etc.); sensor
preliminary alert (flood, typhoon, air-raid, etc.); precautionary warning
alarm (fire, burglar, railroad-crossing, etc.); sensor
nationwide instantaneous alert system; J-Alert system; satellite-based early warning system used in Japan
ground proximity warning system; GPWS
power demand warning; power alert
power demand warning; power alert
false alarm; accidental alarm