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They have in the past been mistaken for UFOS.
In fact, these are lenticular clouds: saucer-shaped formations which typically gather over mountain peaks.
Seen here captured in various locations around the world, they form when strong, wet winds blow over rough terrain.
When the moist air flow encounters obstructions, such as landforms or buildings, standing waves in the atmosphere are created. As the air condenses, the odd-shaped clouds are made.
It’s a relatively rare weather phenomenon, resulting in clouds that are stationary and lens-shaped, and sometimes resemble dramatic vortexes or tornadoes mid-strike.
Here, MailOnline Travel has amassed a collection of impressive images of lenticular clouds, hovering over landscapes from Mount Fuji to Alaska and beyond.
Light, wispy spirals of cloud mark the vivid blue sky seen here in a scene captured over Mount Shasta in California
Lenticular clouds are a relatively rare weather phenomenon, resulting in formations that are stationary and lens-shaped, seen here over Mount Fuji in Japan
Seen above the town of Gevgelija in Macedonia, a lenticular cloud forming amid white streaks left by aircraft
Apocalyptic grey clouds swirl over this mountain range in a staggering photo taken last year in an undisclosed location
Mount Drum, a stratovolcano built from alternate layers of lava and ash, located in the Wrangell Mountains of Alaska, is dwarfed by lenticular clouds
A spiralling lenticular cloud shrouds Mount Fuji in Japan, captured at Lake Tanuki in the Fujinomiya, Shizuoka Prefecture
Miscanti Lagoon looks painterly here as it sits under these saucer-shaped clouds near the Chilean town of San Pedro de Atacama
Pinkish lenticular clouds loom over the Tolbachik, a volcanic complex on the Kamchatka Peninsula in the far east of Russia
The vivid clouds here have formed a particularly unusual pattern as they hover in an otherwise clear sky in Denver, Colorado
Only the peak of Mount Rainier can be seen here through a heavy cloak of fluffy clouds in Washington, with one lenticular formation perched on top
This lenticular cloud formation rests like a hat on a distant volcano, photographed in the Virunga Mountains, Uganda
Sunset at Mount Mckinley with a lenticular cloud overhead as seen from Wonder Lake in the Denali National Park, Alaska
Photographer Akihiro Shibata spotted these arc-like clouds circling the peak of Mount Fuji, the highest mountain in Japan
Satellite dishes sit beneath a night sky bursting with stars at La Palma, in Spain’s Canary Islands, as a series of lenticular clouds hover in between
The lenticular formation to the right has an electrifying effect in this shot taken on an unusually snowy day in Arizona