A middle cloud with vertical development that forms from altocumulus clouds. It is composed primarily of ice crystals in its higher portions and characterized by its turrets, protuberances, or crenelated tops. Its formation indicates instability and turbulence at the altitudes of occurrence.
Meaning of ALTOCUMULUS CASTELLANUS in English
Weather and meteorology English vocabulary. Английский словарь погоды и метеорологии . 2012