上層 じょうそう気流 きりゅうではありませんでした
jōsōkiryūdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 上層気流

1. It was not an upper-level flow.; It was not a high-level current.

Past/Perfective
Negative
Polite
Formal Register