Cirro-cumulus is a type of cloud that is formed by the combination of cirrus and cumulus clouds. It is often described as a high-altitude cloud that resembles small cotton balls. Synonyms for cirro-cumulus include altocumulus, high-level cumulus, and cirrus or cumulus castellanus. Altocumulus clouds are often seen in the sky during the early morning hours, whereas high-level cumulus clouds are typically seen during the afternoon hours. Cirrus or cumulus castellanus clouds are seen in the sky during unstable weather conditions. Regardless of the synonym used, these clouds are a beautiful sight to behold in the sky and can often signal a change in weather.