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Main Cloud Types
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Other Clouds
- Arcus
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- Cap / banner clouds
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- Cataractagenitus
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- Lacunosus
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- Morning Glory Cloud
- Murus (Wall cloud)
- Mediocris
- Nacreous
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- Noctilucent
- Pannus
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- Praecipitatio
- Radiatus
- Silvagenitus
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- 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.
Nacreous clouds over Oslo.
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Nacreous clouds over Cholsey, south Oxfordshire, England.
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Nacreous clouds over Turin, North Italy.
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Nacreous clouds over Fraserburgh, Aberdeenshire, Scotland.
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Nacreous clouds over Aberdeen, Scotland.
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Nacreous clouds over Billingham, NE England.
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Nacreous clouds over Boston, Lincolnshire, England.
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Nacreous clouds with Stratocumulus below, spotted on a flight into Aberdeen, Scotland.
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Nacreous clouds over Blairgowrie, Scotland.
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A nacreous Dolphin over Elgin, Moray, Scotland.
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Nacreous clouds over Shildon, County Durham, England.
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Nacreous clouds over Durham, England.
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Nacreous clouds over Newcastle, England.
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Nacreous clouds over Boston, Lincolnshire, England.
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Nacreous clouds over Elgin, Moray, Scotland.
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