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'Flying saucer' clouds

Posted at 9:40 AM, Mar 29, 2016
and last updated 2016-03-29 09:40:05-04

(CNN NEWSOURCE) What's that up in the sky?

To some, the clouds over Reno, Nevada looked kind of like flying saucers Monday.

They're actually called lenticular clouds.

Scientists say they form in air that passes over a mountain, rise up again and then cool.

And they are most often seen in the winter or spring.