mackerel sky

a sky covered with rows of small, fleecy, cirrocumulus or altocumulus clouds, suggesting the streaks on a mackerel's back

See mackerel sky in American Heritage Dictionary 4

noun
Chiefly Northeastern U.S.
A sky covered with many small cirrocumulus or altocumulus clouds, resembling the markings found on a mackerel. Also called regionally buttermilk sky.

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mackerel sky

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