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Other Clouds
- Arcus
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- Vertebratus
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- Volutus (Roll cloud)
Optical Effects
- 22° Halo
- 46° Halo
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- Parry infralateral arc
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- Suncave parry arc
- Sun dog (Parhelion)
- Sun pillar
- Supernumerary bows
- Subparhelic circle
- Supralateral arc
- Upper tangent arc
- Wegener arc
Although mamma (mammatus) usually form on the base of a cumulonimbus anvil, they can also form on other cloud types such as stratocumulus, altostratus, or in this case, in a subtle way within altocumulus, spotted here over Monte Porzio Catone, Rome, Italy.
Cirrocumulus with signs of a possible cavum (fallstreak hole), spotted over Kingston, Tasmania, Australia
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Sunset near Antelope Valley, California, US
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Iridescence with some cumulus fractus over New Taipei City, Taiwan
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Undulatus over Weymouth, Dorset, England
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Altocumulus stratiformis over Yeonsu-gu, Incheon, South Korea
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Asperitas over Puyallup, Washington, US
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Sun Dog over Craigville Beach, United States
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Clouds illuminated by moonlight, urban light, and lightning over Montezuma Creek, Utah, US
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Altocumulus in both its stratiformis and lenticularis forms, along with undulatus and cumulus fractus in this mixed sky over Neibla, near Valdivia, Chile.
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A contrail amidst the cumulus fractus, spotted over Gwangju-si, South Korea
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Virga in the background and birds on a wire in the foreground, spotted over Maizuru Park, Fukuoka City, Japan
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Altocumulus radiatus over Coaley Peak, Gloucestershire, England
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Winds coming eastward off of the Cascade mountains create a shearing effect that contributes to the variety of high level cirrus clouds over Cle Elum, Washington, US
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Cumulus in various shapes and sizes, spotted over Cumberland, Maine, US
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Crepuscular rays over Esfahan, Iran
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