Filter By:
Main Cloud Types
- Cumulus
- Stratus
- Stratocumulus
- Altocumulus
- 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
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.
Pileus, also known as a cap cloud, can develop above rapidly rising cumulus or cumulonimbus clouds, as spotted here by Genevieve's father during an evening walk in Minneapolis, Minnesota, US
Leave a Reply Cancel reply
You must be logged in to post a comment.
This site uses Akismet to reduce spam. Learn how your comment data is processed.
A classic example of pileus spotted over Curitiba, Brazil
Leave a Reply Cancel reply
You must be logged in to post a comment.
This site uses Akismet to reduce spam. Learn how your comment data is processed.
Pileus spotted over Curitiba, Brazil
Leave a Reply Cancel reply
You must be logged in to post a comment.
This site uses Akismet to reduce spam. Learn how your comment data is processed.
A classic example of pileus forming over a developing cumulonimbus, spotted over Kilgore, Texas, US
Leave a Reply Cancel reply
You must be logged in to post a comment.
This site uses Akismet to reduce spam. Learn how your comment data is processed.
Cumulus congestus that appears to be on the verge of developing into a cumulonimbus, with a classic example of pileus over the top of its formation, spotted near Tuggeranong, Australian Capital Territory, Australia
Leave a Reply Cancel reply
You must be logged in to post a comment.
This site uses Akismet to reduce spam. Learn how your comment data is processed.
Pileus over Waukesha County, Wisconsin, US
Leave a Reply Cancel reply
You must be logged in to post a comment.
This site uses Akismet to reduce spam. Learn how your comment data is processed.
Pileus accompanying a Cumulus congestus cloud formation above Charlotte, North Carolina, US
Leave a Reply Cancel reply
You must be logged in to post a comment.
This site uses Akismet to reduce spam. Learn how your comment data is processed.
Cloud caps known as pileus forming over the tops of Cumulus congestus clouds and spotted over Little Switzerland, North Carolina, US.
Leave a Reply Cancel reply
You must be logged in to post a comment.
This site uses Akismet to reduce spam. Learn how your comment data is processed.
The distinctive breaking-wave shape of a fluctus cloud feature was spotted here along the top of the accessory cloud cap known as a pileus. This is a rare combination of features, spotted over Franklin County, AL, US.
Leave a Reply Cancel reply
You must be logged in to post a comment.
This site uses Akismet to reduce spam. Learn how your comment data is processed.
Pileus over Launceston, Tasmania.
Leave a Reply Cancel reply
You must be logged in to post a comment.
This site uses Akismet to reduce spam. Learn how your comment data is processed.
A trio of Cumulus congestus with pileus caps over Maplewood, Missouri, US
Leave a Reply Cancel reply
You must be logged in to post a comment.
This site uses Akismet to reduce spam. Learn how your comment data is processed.
Pileus over Waterton Lakes National Park, Alberta, Canada.
Leave a Reply Cancel reply
You must be logged in to post a comment.
This site uses Akismet to reduce spam. Learn how your comment data is processed.
Pileus over Wolf Creek, Montana, US.
Leave a Reply Cancel reply
You must be logged in to post a comment.
This site uses Akismet to reduce spam. Learn how your comment data is processed.
Pileus at sunset over the town of Florenville, in the Belgian Ardennes, near the French border.
Leave a Reply Cancel reply
You must be logged in to post a comment.
This site uses Akismet to reduce spam. Learn how your comment data is processed.
Pileus over Xiamen city, China.
Leave a Reply Cancel reply
You must be logged in to post a comment.
This site uses Akismet to reduce spam. Learn how your comment data is processed.
