Arcus cloud
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An arcus cloud is a low, horizontal cloud formation, usually appearing as an accessory cloud to a cumulonimbus. Roll clouds and shelf clouds are the two main types of arcus clouds. They most frequentl
A striated shelf cloud, in Massachusetts in July 2022
Underside of a weak shelf cloud
A shelf cloud over Enschede, Netherlands
A shelf cloud in Durango, Mexico
Cumulonimbus cloud
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Cumulonimbus is a dense, towering, vertical cloud, typically forming from water vapor condensing in the lower troposphere that builds upward carried by powerful buoyant air currents. Above the lower p
Arcus cloud
…An arcus cloud is a low, horizontal cloud formation, usually appearing as an accessory cloud to a cumulonimbus. Roll clouds and shelf clouds are the two main types of arcus clouds. They most frequently form along the leading edge or gust fronts of thunderstorms…
Cumulonimbus incus over Warsaw, Poland
A cumulonimbus calvus over El Bajío, Guanajuato, Mexico.
Cumulonimbus calvus
A clearly developed cumulonimbus fibrous-edged top capillatus