banner cloud

banner cloud

[′ban·ər ‚klau̇d]
(meteorology)
A cloud plume often observed to extend downwind from isolated mountain peaks, even on otherwise cloud-free days. Also known as cloud banner.

banner cloud

banner cloud
A cloud plume extending downward from a mountain peak and suggesting a banner. This is, often, prevalent on a cloudless day. The cloud may be formed by reduced atmospheric pressure on the leeward side of the peak or may consist of drifting snow.
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Banner clouds typically form in summer months, and also weather conditions on the day the picture was taken probably wouldn't have produced a banner cloud at Mount Everest's altitude of more than 8,800 meters, he says.