晴天霹雳 [- - pī lì]a bolt from the blue; a thundercap from a blue sky; The storm sprang up out of the blue.; (It was like a) thunderbolt out of a clear sky.; thunder in clear weather; thunder without rain:
•¶ 这消息犹如晴天霹雳。 The news was like a thunderbolt out of a clear sky.