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Main Cloud Types
- Cumulus
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- Stratocumulus
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- Altostratus
- Cirrus
- Cirrocumulus
- Cirrostratus
- Nimbostratus
- Cumulonimbus
Other Clouds
- Arcus
- Asperitas
- Cap / banner clouds
- Capillatus
- Castellanus
- Cataractagenitus
- Cauda (Tail cloud)
- Cavum (Fallstreak hole)
- Congestus
- Contrail (homogenitus)
- Duplicatus
- Diamond dust
- Distrail
- Fibratus
- Flammagenitus (Pyrocumulus)
- Floccus
- Fluctus (Kelvin-Helmholtz)
- Fractus
- Homogenitus
- Horseshoe vortex
- Humilis
- Incus
- Intortus
- Lacunosus
- Lenticularis
- Mamma
- Morning Glory Cloud
- Murus (Wall cloud)
- Mediocris
- Nacreous
- Nebulosus
- Noctilucent
- Pannus
- Perlucidus
- Pileus
- Praecipitatio
- Radiatus
- Silvagenitus
- Spissatus
- Stratiformis
- 'Supercilium' (not official classification)
- Translucidus
- Tuba / Twister
- Uncinus
- Undulatus
- Velum
- Vertebratus
- Virga
- Volutus (Roll cloud)
Optical Effects
- 22° Halo
- 46° Halo
- Circumhorizon Arc
- Circumscribed halo
- Circumzenithal Arc
- Cloudbow / Fogbow
- Corona
- Crepuscular rays & shadows
- Diffuse arcs
- Green flash
- Glory
- Halos
- Helic arc
- Infralateral arc
- Iridescence
- Lower Sun Pillar
- Lower Tangent Arc
- Moonbow
- Moondogs
- Parhelic circle
- Parry antisolar arcs
- Parry arc
- Parry infralateral arc
- Parry supralateral arc
- Rainbow
- Sub parhelion
- Sub-sun
- Suncave parry arc
- Sun dog (Parhelion)
- Sun pillar
- Supernumerary bows
- Subparhelic circle
- Supralateral arc
- Upper tangent arc
- Wegener arc
Nacreous clouds, forming at altitudes of 15-25 km (10–20 miles), up in the stratosphere, at temperatures of around -85˚C (-121˚F), these clouds show beautiful iridescent pastel hues as they scatter the light from the Sun when it is just below the horizon. Sometimes called ‘mother-of-pearl clouds’, their tiny, uniform ice crystals are very good at diffracting sunlight. This classic example was spotted in December of a prior year, over Nottingham Castle, Nottingham, England.
A vibrant circumzenithal arc spotted on a summer afternoon a number of years ago, amidst a swing ride in the foreground, over Old Market Square, Nottingham, England
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An abundance of virga spotted over Phoenix, Arizona, US
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During an afternoon wherein there was a Tornado Warning for the county, mammatus (mamma) clouds develop in association with a storm, spotted over Wiliamson County, Texas, US
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Lacunosus clouds, the honeycombs of the sky, spotted over Oakland, California, US
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Cumulonimbus near Alpine, Texas, US
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An imposing storm system from which Patrick said produced small hail and a small funnel, east of Brighton, Colorado, US
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Sun Dog (Parhelion) spotted over Ormskirk, Lancashire, England
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Rainbow over Manchester, Connecticut, US
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A broad and impressive display of asperitas over Wancennes, Belgium
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Lightning within a storm system over Sydney, Australia
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A classic example of a multi-layered altocumulus lenticularis duplicatus, spotted over Ponta Delgada Harbour, Sao Miguel, Azores, Portugal
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Cumulus mediocris "floating" over the fields near Greatham, Hampshire, England
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Asperitas in the late afternoon near Vermontville, Adirondacks, New York, US
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22-degree lunar halo over Port Melbourne, Victoria, Australia
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Virga via two distinct rows of clouds over Northern California, US
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