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Other Clouds
- Arcus
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- Cavum (Fallstreak hole)
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- Mediocris
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- Pileus
- Praecipitatio
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- 'Supercilium' (not official classification)
- Translucidus
- Tuba / Twister
- Uncinus
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- 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
A soaring bird in the morning sky over Santa Rosa, California, US
Pileus are small, horizontal clouds that form above cumulus or cumulonimbus clouds, due to rising air that condenses into a smooth shape upon reaching its dew point, and this formation is usually an indicator of severe weather. This classic example was spotted over Bethesda, Maryland, US.
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A skylight of the Weatherspoon Art Museum at the University of North Carolina - Greensboro providing a view of altocumulus perlucidus over Greensboro, North Carolina, US
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Cumulus over Ashland, Virginia, US
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Low lying stratus approaching San Francisco Airport, California, US
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A portion of a 22-degree halo is visible in this photograph, amidst the cirrostratus over Healdsburg, California, US
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An expansive display of altocumulus over Santa Rosa, California, US
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Fog which covered the hillside in the morning had started floating upward, looking like soft cotton candy, spotted over Santa Rosa, California, US
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The view shortly after take-off from Dulles Airport, Virginia, US
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Cumulus congestus propagating over Arlington, Virginia, US
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Evening sky on the longest day of the year, near Falls Church, Virginia, US
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Altocumulus perlucidus over Falls Church, Virginia, US
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Altocumulus perlucidus under fading sunlight, spotted over Falls Church, Virginia, US
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Cumulus drifting over the Washington Monument in Washington D.C., US
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Remnants of multiple contrails spotted over West Falls Church, Virginia, US
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Crepuscular rays emanating from behind cumulus congestus, spotted over Falls Church, Virginia, US
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