This month a KDKA viewer saw unusual clouds like breaking waves in the sky as he was traveling on the Turnpike to Philadelphia.

Our planet isn’t the only one that has these clouds. This photo of Saturn’s north polar vortex shows Kelvin-Helmholtz clouds on the spinning edge. Photographed by the Cassini spacecraft in April 2013 and colorized by NASA, this image is called The Rose but is actually a violent, relentless storm. And it’s big!

According to the Cassini Mission at NASA, “Measurements have sized the eye at a staggering 1,250 miles (2,000 kilometers) across with cloud speeds as fast as 330 miles per hour (150 meters per second).”

Our own polar vortex is mild by comparison.

(photo from NASA via Wikimedia Commons; click on the caption to see the original)