thundercloud

/ˈθʌndərˌklaʊd/
noun
  1. A large, dark cloud that produces thunder and lightning, usually bringing a storm.
    • Pilots avoid flying through thunderclouds because of the dangerous turbulence.
    • The sky turned dark as a massive thundercloud rolled in from the west.
    • Thunderclouds gathered overhead, and we knew a storm was coming.
  2. A sign of trouble or a threatening situation.
    • Her mood was like a thundercloud, dark and ready to burst.
    • The angry look on his face was a thundercloud of bad news.
    • Thunderclouds of war were gathering across the border.
Synonyms
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