Altocumulus cloud

Altocumulus cloud

Infobox Cloud
name = Altocumulus cloud
image location = Altocumulus02.jpg


abbreviation = Ac
symbol = CM_6.png genus= Alto- ("high"), -cumulus ("heap")
species=
variety=
altitude_m = 2400-6100
altitude_ft = 8,000-20,000
level = medium-ish
appearance = Similar to cirrocumulus, but individual segments are larger and darker.
precipitation = No, but usually signifies an oncoming thunderstorm.

Altocumulus ("Alto", "high", "cumulus", "heaped") is a cloud belonging to a class characterized by globular masses or rolls in layers or patches, the individual elements being larger and darker than those of cirrocumulus and smaller than those of stratocumulus. Like other cumulus clouds, altocumulus signifies convection. It is usually white or gray, and often occurs in sheets or patches with wavy, rounded masses or rolls. Altocumulus often are seen preceding a cold front, and their presence on a warm, humid, summer morning frequently signals the development of thunderstorms later in the day. Alto means high and these clouds may cause rain if they are higher up.

One form of altocumulus, "altocumulus lenticularis" (Lenticular cloud) is frequently reported as "Unidentified flying objects".The altocumulus approach can sometimes be frightening, for the cloud has a dark and scary appearance. It about 8,000 feet to 20,000 feet above ground level.

External links

* [http://www.clouds-online.com Clouds-Online.com Cloud Atlas with many photos and description of the different cloud genus]
* [http://www.nsdl.arm.gov/Library/glossary.shtml#Altocumulus National Science Digital Library - Altocumulus]
* [http://www.geographyinaction.co.uk/Assets/Photo_albums/Nine/pages/Altocumulus.html Altocumulus]
* [http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/cld/cldtyp/mdl/altcu.rxml WW2010: University of Illinois] s


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