Imaggeo On Monday: The evolution of a cloud during a day

Imaggeo On Monday: The evolution of a cloud during a day

A cloud in the lee of the Patagonian Andes observed during an entire day. The shape of the cloud changed from lenticular to whirl- and funnel-shaped.

Description by Christoph Mayr, after the description on


Konstantinos Kourtidis also added a comment to the image, explaining more about how lenticular clouds like these can form:

“That’s a great photo sequence. The cloud is a lenticular cloud, they are not often easy to see. When stable moist air flows over a large eddy, like those caused by a mountain, a series of standing waves form on the leeward side of the mountain. If the temperature at the crest of the wave drops below the dew point moisture condensation, it may form a lenticular cloud.”


Imaggeo is the EGU’s online open access geosciences image repository. All geoscientists (and others) can submit their photographs and videos to this repository and, since it is open access, these images can be used for free by scientists for their presentations or publications, by educators and the general public, and some images can even be used freely for commercial purposes. Photographers also retain full rights of use, as Imaggeo images are licensed and distributed by the EGU under a Creative Commons licence. Submit your photos at

This guest post was contributed by a scientist, student or a professional in the Earth, planetary or space sciences. The EGU blogs welcome guest contributions, so if you've got a great idea for a post or fancy trying your hand at science communication, please contact the blog editor or the EGU Communications Officer to pitch your idea.

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