noun
cirrus cloud; streaky cloud
Colloquial term for thin, wispy clouds that look like streaks or lines in the sky. The formal meteorological term is 巻雲 (けんうん).
See also: 巻雲
空にすじ雲が広がっている。
Cirrus clouds are spreading across the sky.
すじ雲が出ると、天気が下り坂になることが多い。
When cirrus clouds appear, the weather often turns bad.
Formal meteorological term for cirrus clouds; すじ雲 is the everyday, colloquial equivalent.
Compound of すじ (筋, 'line, streak') and 雲 (くも, 'cloud'), literally 'streak cloud'. The reading ぐも is a rendaku (sequential voicing) of くも.