There are way more types of clouds in the world than “big, white, and puffy,” despite what the drawings of nearly every five year old or, let’s face it, adult would suggest. Varying with altitude, moisture content and how the atmosphere is moving around, clouds come in a vast array of unusual shapes and sizes. Some take on undulating forms, like gravity wave clouds, which arise when a stream of wind undulates up and down as it flows through the air, with clouds forming at the peaks of the wave and clearings at the troughs. And that’s just the beginning. When unusual clouds arise, people tend to get pretty excited.
- Smithsonian.com
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