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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)
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