Arcus cloud

A time-lapse photography of shelf cloud just before a thunderstorm at Pondicherry

A shelf cloud over Enschede, Netherlands

A roll cloud associated with a severe thunderstorm over Racine, Wisconsin, United StatesCoastal roll cloud in Uruguay

An arcus cloud is a low, horizontal cloud formation. Roll clouds and shelf clouds are the two types of arcus clouds. A shelf cloud is usually associated with the leading edge of thunderstorm outflow; roll clouds are usually formed by outflows of cold air from sea breezes or cold fronts in the absence of thunderstorms.

单词	Cumulonimbus arcus
释义	Cumulonimbus arcus 英语百科 Arcus cloud An arcus cloud is a low, horizontal cloud formation. Roll clouds and shelf clouds are the two types of arcus clouds. A shelf cloud is usually associated with the leading edge of thunderstorm outflow; roll clouds are usually formed by outflows of cold air from sea breezes or cold fronts in the absence of thunderstorms.
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Cumulonimbus arcus

Arcus cloud