Cirrocumulus castellanus

Type of cloud

Cirrocumulus castellanus
Cirrocumulus castellanus undulatus (on the center)
Abbreviation	Cc cas
Symbol
Genus	Cirro- (curl) -cumulus (heaped)
Species	Castellanus (castle)
Altitude	Above 6,000 m (Above 20,000 ft)
Classification	Family A (High-level)
Appearance	small, rounded turrets
Precipitation	Virga only

Cirrocumulus castellanus or Cirrocumulus castellatus^[1] is a type of cirrocumulus cloud. Castellanus is from the Latin meaning "of a castle".^[2] These clouds appear as round turrets that are rising from either a lowered line or sheet of clouds.^[3] Cirrocumulus castellanus is an indicator of atmospheric instability at the level of the cloud.^[4] The clouds form when condensation occurs in the base cloud, causing latent heating to occur. This causes air to rise from the base cloud, and if the air ascends into conditionally unstable air, cirrocumulus castellanus will form.^[5]

References

^ "Appendix 3 - History of cloud nomenclature".
^ Numen - The Latin Lexicon. "Definition of castellanus". Retrieved 13 July 2011.
^ Dunlop, Storm (2003). The weather identification handbook (1st Lyons Press ed.). Guilford, Conn.: Lyons Press. p. 66. ISBN 1-58574-857-9.
^ Callanan, Martin. "Cirrocumulus castellanus". International Cloud Atlas. nephology.eu. Archived from the original on 30 December 2020. Retrieved 13 July 2011.
^ Ahrens, C. Donald (2007). Keith Dodson (ed.). Meteorology Today: An Introduction to Weather, Climate, and the Environment. Belmont, CA: Cengage Learning. p. 158. ISBN 978-0-495-01162-0.

External links

International Cloud Atlas – Cirrocumulus castellanus Archived 2020-12-30 at the Wayback Machine

Cirrocumulus cloud (Cc) types

Species

Cirrocumulus castellanus (Cc cas)
Cirrocumulus floccus (Cc flo)
Cirrocumulus lenticularis (Cc len)
Cirrocumulus stratiformis (Cc str)

Varieties

Cirrocumulus lacunosus (Cc la)
Cirrocumulus undulatus (Cc un)

Variants

Cirrocumulus mamma
Cirrocumulus virga

Cloud genera and selected species, supplementary features, and other airborne hydrometeors - WMO Latin terminology except where indicated

Mesospheric

Extreme-level
80–85 km

Noctilucent (NLC) Polar mesospheric clouds	Noctilucent type I veils Noctilucent type II bands Noctilucent type III billows Noctilucent type IV whirls

Stratospheric

Very high-level
15–30 km

Nacreous polar stratospheric clouds (PSC)	Cirriform nacreous Lenticular nacreous
Nitric acid and water polar stratospheric clouds (PSC)	No differentiated sub-types; tends to resemble cirrostratus

Tropospheric

High-level
3–18 km

Cirrus (Ci)

Species	Cirrus castellanus (Ci cas) Cirrus fibratus (Ci fib) Cirrus floccus (Ci flo) Cirrus spissatus (Ci spa) Cirrus uncinus (Ci unc)
Ci-only varieties	Cirrus intortus (Ci in) Cirrus vertebratus (Ci ve)

Cirrocumulus (Cc)

Species	Cirrocumulus castellanus (Cc cas) Cirrocumulus floccus (Cc flo) Cirrocumulus lenticularis (Cc len) Cirrocumulus stratiformis (Cc str)

Cirrostratus (Cs)

Species	Cirrostratus fibratus (Cs fib) Cirrostratus nebulosus (Cs neb)

High-level-only
mutatus cloud

Mutatus non-height specific (see below)

Medium-level
2–8 km

Altocumulus (Ac)

Species	Altocumulus castellanus (Ac cas) Altocumulus floccus (Ac flo) Altocumulus lenticularis (Ac len) Altocumulus stratiformis (Ac str) Altocumulus volutus (Ac vol)

Altostratus (As)

Altostratus undulatus

Nimbostratus (Ns)
Multi-level

Varieties	Nimbostratus virga (Ns vir)

Low-level
0–2 km

Cumulonimbus (Cb)
Towering vertical

Species	Cumulonimbus calvus (Cb cal) Cumulonimbus capillatus (Cb cap)
Cb-only supplementary features	Cumulonimbus cauda ((cau) Tail cloud) Cumulonimbus incus (inc) Cumulonimbus murus ((mur) Wall cloud)
Cb-only accessories and other	Cumulonimbus flumen ((Cb flu) Beaver tail) Overshooting top Hot tower

Cumulus (Cu)
Variable vertical extent

Species	Fractus Cumulus humilis (Cu hum) Cumulus mediocris (Cu med) (Cumulus congestus (Cu con) (Cumulus castellanus (unofficial alternative name for Cu con)) (ICAO term for Cu con and "Cu cas" is Towering cumulus [Tcu]))
Other	Horseshoe Trade wind cumulus

Stratus (St)

Species	Stratus fractus (St fra) Stratus nebulosus (St neb)
St-only genitus cloud and other	Stratus silvagenitus (St sil) Fog (Fg) Surface level

Stratocumulus (Sc)

Species	Stratocumulus castellanus (Sc cas) Stratocumulus floccus (Sc flo) Stratocumulus lenticularis (Sc len) Stratocumulus stratiformis (Sc str) Stratocumulus Undulatus Stratocumulus volutus (Sc vol)

Low-level-only
supplementary features

Arcus ((arc) Shelf)
Tuba ((tub) Funnel cloud)

Low-level-only
accessory cloud and other

Pileus (pil)
Velum (vel)
Pannus (pan)
Other- Actinoform cloud (Stratocumulus)

Non-height
specific

Varieties	Duplicatus (du) Lacunosus (la) Opacus (op) Perlucidus (pe) Radiatus (ra) Translucidus (tr) Undulatus (un)
Supplementary features	Asperitas (asp) Cavum (cav) Fluctus (flu) Mamma (mam) Praecipitatio (pra) Virga (vir)
Mother clouds and human-made clouds	(Mother cloud)+genitus (e.g. cumulogenitus (cugen) (Mother cloud)+mutatus (e.g. cumulomutatus (cumut) Homogenitus (hogen) Homomutatus (homut)