Cirrus duplicatus

{{Short description|Form of cirrus cloud}}

{{Infobox Cloud

|name=Cirrus duplicatus

|image location=

|image name=

|abbreviation=Ci du

|symbol=Clouds H1.svg

|genus=Cirrus (curl)

|species=

|variety=duplicatus (double)

|altitude_m=Above 5,000

|altitude_ft=Above 16,500

| level =

|appearance=two or more overlapping layers{{cite web|title=Cirrus|url=http://www.clouds-online.com/cloud_atlas/cirrus/cirrus.htm|work=Cloud Atlas|accessdate=13 July 2011|author=Wolken Online|archive-date=3 April 2019|archive-url=https://web.archive.org/web/20190403032913/https://www.clouds-online.com/cloud_atlas/cirrus/cirrus.htm|url-status=dead}}

|precipitation=No

| thickness =

| Ice content =

}}

Cirrus duplicatus is a variety of cirrus cloud. The name cirrus duplicatus is derived from Latin, meaning "double".{{cite web|title=duplicatus|url=http://latinlookup.com/word/18551/duplicatus|accessdate=13 July 2011|author=Latin Lookup|archive-url=https://web.archive.org/web/20120327014557/http://latinlookup.com/word/18551/duplicatus|archive-date=27 March 2012|url-status=dead}} The duplicatus variety of cirrus clouds occurs when there are at least two layers of cirrus clouds. Most of the time, occurrences of cirrus fibratus and cirrus uncinus are in the duplicatus form.{{cite web|last=Callanan|first=Martin|title=Cirrus duplicatus|url=http://nephology.eu/cirrus/cirrus-duplicatus|work=International Cloud Atlas|publisher=nephology.eu|accessdate=13 July 2011|archive-date=11 November 2022|archive-url=https://web.archive.org/web/20221111194034/http://nephology.eu/cirrus/cirrus-duplicatus|url-status=dead}} Like stratus clouds, cirrus clouds are often seen in the duplicatus form.{{cite book|last=Dunlop|first=Storm|title=The weather identification handbook|year=2003|publisher=Lyons Press|location=Guilford, Conn.|isbn=1-58574-857-9|page=58|url=https://books.google.com/books?id=KoZMvgAACAAJ|edition=1st Lyons Press}}