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
Cumulonimbus incus
A cumulonimbus calvus over El Bajío, Guanajuato, Mexico.
Cumulonimbus calvus
A clearly developed cumulonimbus fibrous-edged top capillatus