海洋 かいよう気象 きしょう だいではありませんでした
kaiyōkishō daidewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 海洋気象台

1. Was not a marine meteorological station.; Was not a marine weather station.

Past/Perfective
Negative
Polite
Formal Register