A lenticular cloud is a lens-shaped cloud that normally develops on the downwind side of a mountain or mountain range. This occurs when stable, moist air flows over a mountain, creating a series ...

Lenticular clouds are elliptical—on Earth as they are ... The crispy brown lines of dust seen in the image probably took shape due to the merger, according to a NASA release.

Roll clouds mark a sharp temperature contrast where warm air moves up over shallow cold air, continually reforming water vapor in the same place, like a lenticular cloud. Since temperature ...