熱帯 ねったい せい てい気圧 きあつでしょう
nettaiseiteikiatsudeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 熱帯性低気圧

1. Probably a tropical depression.; Probably a tropical cyclone.

Polite
Presumptive
Conjecture