An official tsunami warning issued when there is a risk of tsunami (e.g., after an earthquake), prompting coastal evacuations.
地震の後、沿岸に津波警報が出された。
After the earthquake, a tsunami warning was issued for the coast.
津波警報が発令されたら高台へ避難してください。
If a tsunami warning is issued, please evacuate to higher ground.
早朝に津波警報のサイレンが鳴った。
The tsunami warning siren sounded early in the morning.