noun
tsunami warning
Official alert issued by meteorological agencies when a tsunami is expected or detected.
地震の後、津波警報が発表された。
After the earthquake, a tsunami warning was issued.
津波注意報 is a lower-level 'tsunami advisory', while 津波警報 is a more urgent 'tsunami warning'.
Compound of 津波 (tsunami) and 警報 (warning, alarm).