Altocumulus opacus, a dense cloud deck at middle altitude that is a mixture between altocumulus and altostratus. Such decks often show gravity waves, as on the photo.
All material on this site is copyright of Harald Edens, unless explicitly noted otherwise. Reproduction of
any of this material in any form without my prior approval is not allowed! For any questions
concerning this site, read the contact information, and send an email if your question is
not answered there.
