air raid
alarm
alert
announce
announcement
attack
civil
civilian
communication
danger
defense
detection
disaster
earthquake
emergency
evacuate
evacuation
fire
flood
hazard
horn
inform
loudspeaker
megaphone
military
new zealand
ocean
outdoor
pole
post
public
risk
safety
sea
seismic
signal
siren
sky
sound
speaker
storm
system
tidal wave
transmission
tsunami
war
warn
warning
weather
world