晴天 せいてん らん気流 きりゅうじゃないです
seitenrankiryūjanaidesu

Noun
Desu Copula
Negation Auxiliary

The polite negative form of 晴天乱気流

1. It's not clear skies and turbulence.; It's not a clear, turbulent sky.

Negative
Polite
Casual Register