かなとこ雲ぐも

noun

anvil cloud

A cumulonimbus cloud whose top has spread into a flat, anvil-like shape, often associated with thunderstorms.

• 遠とおくの空そらにかなとこ雲ぐもが見みえたら、激はげしい雷らい雨うに注ちゅう意いが必ひつ要ようだ。

  If you see an anvil cloud in the distant sky, be prepared for severe thunderstorms.