stac pollaidh, banner clouds, cloud, isolated peaks, lee eddy, mountain, assynt, scotland, nature reserve, photo

Stac Pollaidh and Banner Cloud No.1

Inverpolly National Nature Reserve, Assynt, Scotland

 Stationary banner clouds form down wind of isolated peaks and can remain for many hours. The mechanism for this is the presence of a lee eddy which forces air coming over the mountain, up again until it condenses and forms a cloud.

. Photo © copyright by Graham Chalmers.

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