Castellanus

From Glossary of Meteorology
(Redirected from Cirrocumulus castellanus)



castellanus

(Previously called castellatus.) A cloud species of which at least a fraction of its upper part presents some vertically developed cumuliform protuberances (some of which are taller than they are wide) that give the cloud a crenellated or turreted appearance.

This castellanus character is especially evident when the cloud is seen from the side. The cumuliform cloud elements generally have a common base and usually seem to be arranged in lines. The species is found only in the genera cirrus, cirrocumulus, altocumulus, and stratocumulus. Cirrus castellanus differs from cirrocumulus castellanus in that its vertical protuberances subtend an angle of more than 1° when observed at an angle of more than 30° above the horizon. When altocumulus castellanus and stratocumulus castellanus attain a considerable vertical development, they become cumulus congestus and often develop into cumulonimbus. Stratocumulus castellanus should not be confused with stratocumulus pierced by cumulus.
See cloud classification.


Copyright 2022 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact permissions@ametsoc.org. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code § 107) or that satisfies the conditions specified in Section 108 of the U.S.Copyright Act (17 USC § 108) does not require AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, require written permission or a license from AMS. Additional details are provided in the AMS Copyright Policy statement.