Denshi Jisho — Online Japanese dictionary

晴天 せいてん fine weather
Common word, Noun 
晴天続き せいてんつづき spell of fine weather
Noun 
晴天の霹靂 せいてんのへきれき a bolt out of the blue
Expression, Noun 
晴天乱気流 せいてんらんきりゅう clear-air turbulence
Noun 

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