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Encyclopaedia Nebularum

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Welcome to the Encyclopaedia Nebularum,
the free nephology and meteorology encyclopedia that anyone can edit.
We currently have 162 articles in English.

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Featured article

A pileus forming above a cumulonimbus calvus cloud.


Pileus (Latin for felt cap) is a thin tropospheric sheet of cloud made of ice crystals on the top of or direcly above another cloud (usually cumulus or cumulonimbus calvus). Pileus looks like a cap-like formation on top of its associated cloud. Pileus clouds form when air in a cloud ascends quickly (usually at speeds of 20 to 50 km/hr.), causing an moist airmass to be thrust upward and causing the water inside it to condense into a pileus cloud as the airmass cools. A pileus will change shape quickly and usually fades away or joins its associated cloud after a short while. For some time after the associated cloud joins the pileus, the pileus may remain draped over the cloud or penetrated by it before the two completely merge. Some pileus clouds may not form above cumulus or cumulonimbus clouds, but rather above volcanic ash clouds or above mountainsides... (Read more)

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Wanted pages

Cirrus radiatus - Cumulus castellanus - Fog - Mammatus - Nimbostratus - Nimbus - Precipitation - Pyrocumulonimbus - Wind shear - Atmosphere


category:Stratus clouds

category:Stratocumulus clouds

category:Cumulus clouds

category:Cumulonimbus clouds

category:Altostratus clouds

category:Altocumulus clouds

category:Cirrus clouds

category:Cirrostratus clouds

category:Cirrocumulus clouds


category:Atmospheric phenomena


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