積 乱 雲(せきらんうん)

せきらんうん

noun

cumulonimbus cloud

formalacademicweather

1. cumulonimbus cloud; thunderhead

A massive, towering cloud formation that develops vertically and produces heavy rain, thunder, lightning, and sometimes hail or tornadoes. The formal meteorological term.

積乱雲(せきらんうん)が発生(はっせい)している。

A cumulonimbus cloud is forming.

夏(なつ)は積乱雲(せきらんうん)が発達(はったつ)しやすく、夕立(ゆうだち)の原因(げんいん)になる。

Cumulonimbus clouds tend to develop easily in summer, causing sudden evening showers.

気象庁(きしょうちょう)は積乱雲(せきらんうん)の急速(きゅうそく)な発達(はったつ)に注意(ちゅうい)するよう呼(よ)びかけた。

The Japan Meteorological Agency called for caution regarding the rapid development of cumulonimbus clouds.

A compound of 積(せき) (accumulate) + 乱(らん) (turbulent) + 雲(うん) (cloud). This is the formal meteorological term used in weather forecasts and science education. In everyday Japanese, the same cloud type is often called 入道雲(にゅうどうぐも) (literally "priest cloud," referring to the bald-headed shape).

Common collocations

積乱雲(せきらんうん)が発達(はったつ)する: cumulonimbus clouds develop
積乱雲(せきらんうん)が発生(はっせい)する: cumulonimbus clouds form
積乱雲(せきらんうん)に注意(ちゅうい): watch out for cumulonimbus
発達(はったつ)した積乱雲(せきらんうん): well-developed cumulonimbus

Related words

入道雲(にゅうどうぐも): everyday name for towering cumulonimbus (summer cloud)
雷雲(らいうん): thundercloud (general term)
積雲(せきうん): cumulus cloud (the smaller, fluffy type)
乱層雲(らんそううん): nimbostratus (rain-producing layer cloud)

Related Words

Related: 入道雲(にゅうどうぐも) (everyday name for towering cumulonimbus)

Related: 雷雲(らいうん) (thundercloud)

Related: 積雲(せきうん) (cumulus cloud)

Related: 高層雲(こうそううん) (altostratus)

Compare: 高積雲(こうせきうん) (altocumulus cloud)

general

Added 2026.5.8 0:22 · Revised 2026.9.2 13:02

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