noun
cirrocumulus cloud; mackerel sky
Refers to high-altitude clouds that look like fish scales. Often used in weather contexts or poetic descriptions.
See also: 巻積雲
空一面にうろこ雲が広がっている。
Cirrocumulus clouds are spread across the whole sky.
うろこ雲が出ると、天気が下り坂になることが多
When cirrocumulus clouds appear, the weather often turns bad.
Compound of うろこ (scale) + 雲 (cloud), from the scale-like appearance of the clouds.