Comma cloud system

From Glossary of Meteorology

comma cloud system

A cloud system that resembles the comma punctuation mark.

The formation has a head and a tail and an upstream edge shaped like an "S." The comma shape results from differential rotation of the cloud border, and is further influenced by adjacent upward and downward vertical motions. Comma patterns vary in size from small convective complexes to large storm systems.

Copyright 2022 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact 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.