noun
major tsunami warning
Official warning issued when a tsunami of 3 meters or higher is expected. Stronger than a regular 津波警報 (tsunami warning).
See also: 津波警報 (つなみけいほう)
気象庁は大津波警報を発表した。
The Japan Meteorological Agency issued a major tsunami warning.
大津波警報が出たら、すぐに高台へ避難してください。
If a major tsunami warning is issued, please evacuate to high ground immediately.
Compound of 大 (large) + 津波 (tsunami) + 警報 (warning).