- Chiefly Northeastern U.S. A sky covered with many small cirrocumulus or altocumulus clouds, resembling the markings found on a mackerel. Also referred to as regionally buttermilk sky.
- a sky filled up with a normal structure of altocumulus clouds notably resembling skin of a mackerel.
- a sky flecked with tiny white clouds; a cirro-cumulus. See Cloud.
- A sky full of rows of cirrocumulus or small altocumulus clouds.
- A sky where the clouds possess type called cirro-cumulus—that is, are damaged into fleecy masses three, four, or even more times as long as they're broad, and organized in synchronous groups. Also called mackerel-back sky.
- a sky full of rows of cirrocumulus or tiny altocumulus clouds
Hypernym for "mackerel sky"
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