mackerel sky in English
noun
1
a sky dappled with rows of small white fleecy clouds, typically cirrocumulus, like the pattern on a mackerel's back.
Cirrocumulus is sometimes referred to as a mackerel sky because of the shapes it takes on.
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1. The term mackerel sky is also common to Altocumulus (and cirrocumulus) clouds that display a pattern resembling fish scales.
2. Altocumulus From the Latin altum, ‘height’ and cumulus, ‘heap’, the name of a genus of clouds composed largely of water droplets and consisting of grey-white sheets, or banded layers and rolls, which may also be broken up into cells.Sometimes it has a banded appearance, occasionally giving a mackerel-sky effect; this is probably associated with strong vertical wind shear in middle