WordReference Random House Unabridged Dictionary of American English © 2025
mack′erel sky′, 
  1. Meteorologyan extensive group of cirrocumulus or altocumulus clouds, esp. when well-marked in their arrangement: so called because of a resemblance to the scales on a mackerel.
  • 1660–70

Collins Concise English Dictionary © HarperCollins Publishers::
mackerel sky
  1. a sky patterned with cirrocumulus or small altocumulus clouds
Etymology: from the similarity to the pattern on a mackerel's back
'mackerel sky' also found in these entries (note: many are not synonyms or translations):
cirrocumulus

Forum discussions with the word(s) "mackerel sky" in the title:


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