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, 01:56, September 22, 2008
'''Altocumulus''' clouds are small, puffy-shaped clouds that usually appear in regularly-spaced groups at [[altitude]]s of 8,000 to 20,000 feet. They indicate a layer of atmospheric [[instability]] and, when observed in the morning during the spring or summer months, indicate a very high probability of precipitation in the afternoon.
=== external links ===
* [http://ww2010.atmos.uiuc.edu/(Gh)/wwhlpr/altocumulus.rxml?hret=/guides/mtr/cld/cldtyp/home.rxml University of Illinois cloud catalog]