Mackerel sky

noun

Definitions

Noun
  1. 1
    A sky filled with a regular pattern of altocumulus clouds somewhat resembling the skin of a mackerel.

    "1717, Dictionarium Rusticum, Urbanicum & Botanicum, London: J. Nicholson et al., 2nd edition, “CLOUDS,” […] in a fair day, if the Sky seem to be dappled with white Clouds, which is usually termed, A Mackerel-Sky, it commonly predicts rain:"

  2. 2
    a sky filled with rows of cirrocumulus or small altocumulus clouds wordnet

Etymology

From mackerel + sky.

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