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Main Cloud Types:
Cumulus
Stratocumulus
Stratus
Altocumulus
Altostratus
Cirrus
Cirrocumulus
Cirrostratus
Nimbostratus
Cumulonimbus
Other Cloud Types:
arcus
asperatus
Cap / banner clouds
capillatus
Contrails
Diamond dust
duplicatus
Fallstreak holes
fibratus
floccus
fractus
Horseshoe vortex
humulus
incus
Kelvin-Helmholtz cloud
lacunosus
lenticularis
mamma (mammatus)
Nacreous
Noctilucent
pannus
perlucidus
pileus / velum
praecipitatio
Pyrocumlus / fumulus
radiatus
Roll cloud
stratiformis
The Morning Glory
tuba / twisters
uncinus
undulatus
vertebratus
virga
Optical Effects:
Circumhorizon arc
Circumzenithal arc
Cloudbow / fogbow
Corona
Crepuscular rays & shadows
Glory
Green flash
Halos
Iridescence
Lower Tangent Arc
Moondogs
Parhelic circle
Rainbow
Sub Parhelion
Sub-sun
Sun pillar
Suncave Parry arc
Sundogs
Unidentified effect
Upper tangent arc
Miscellaneous:
A classic example
Above the clouds
At night
Clouds that look like things
Clouds with names
Fog/mist
Lightning
Mixed sky
Northern Lights
Our favourites
Sunset / sunrise