00:00Looking out of an airplane window at 30,000 feet,
00:03this passenger spotted something
00:04that looked like a glitch in the atmosphere.
00:07A bizarre, perfectly straight cloud formation,
00:10stretching for hundreds of miles across the ocean horizon.
00:14This rare meteorological phenomenon is known as a roll cloud.
00:19Created when an advancing cold front collides
00:21with warm sea air, the thermal boundary rolls the moisture
00:25into an endless horizontal tube,
00:27a solitary atmospheric wave cutting the planet in half.