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Altocumulus Clouds

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Altocumulus: These clouds form between 6000 and 20000 feet (1,8 and 6 km) above sealevel and appear as gray, puffy blobs, sometimes rolled out in parallel waves or bands. One part of the cloud is usually darker than the rest, which helps distinguish this cloud from the higher cirrocumulus clouds. Altocumulus clouds that look like "little castles" in the sky (castellanus) indicate rising air at the cloud level. The appearance of these clouds on a warm, humid summer morning are often followed by afternoon thunderstorms.




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