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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 53 articles in English.

Clouds
Precipitation
Atmospheric phenomena

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Pileus

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)

Did you know...

that Stratus clouds most commonly form near the coast and mountains?
that Cumulonimbus incus can cause tornadoes?
that clouds are formed by condensation?

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

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