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Explore Altostratus Cloud, Cap Cloud and more!

“Mammatus clouds are most often associated with the anvil cloud and severe thunderstorms. They often extend from the base of a cumulonimbus, but may also be found under altocumulus, altostratus, stratocumulus, and cirrus clouds, as well as volcanic ash clouds. When occurring in cumulonimbus, mammatus are often indicative of a particularly strong storm or perhaps even a tornadic storm.”

This mysterious cloud was the Cloud Appreciation Society's Cloud of the Month for November. Image via

from Onextrapixel – Web Design and Development Online Magazine

35 Incredible Examples of Natural Phenomenon Photography

A pileus, also called scarf cloud or cap cloud, is a small, horizontal, altostratus cloud that can appear above a cumulus or cumulonimbus cloud, giving the parent cloud a characteristic "hoodlike" appearance.

from The Telegraph


Wave Clouds - altostratus undulatus - I saw some of these for the first time today! I caught a picture on my phone, but this is much better.