A massive cloud shaped like a flying saucer covered the top of California's Mount Shasta on Jan. 22.
Lenticular clouds can form in a stable atmosphere when wind blows moisture-rich air up and over a mountain. As the air moves up, it cools to a point where it condenses and forms a cloud.
"There's moisture in the air that’s blowing, and it comes up the mountain and condenses as it gets cooler — that’s where you have the cloud form. Since you have an obstacle in the way, the air goes around the mountain both ways, and you get a saucer shaped cloud," To get even more technical, the air blowing up and over the mountains creates what scientists call"gravity waves" and these play a key role in creating these clouds.
"These gravity waves more specifically are orographic gravity waves," Cora Randall, a professor in the University of Colorado Boulder's Department of Atmospheric and Oceanic Sciences, wrote in an email."As the air ascends, it cools and the water vapor condenses into clouds. But gravity then pulls the air down on the other side of the mountain, causing it to compress and warm up. This causes the clouds to dissipate.
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