A swath of cloud streets, also known as horizontal convective rolls, rake across the sky above the southern tip of Greenland in this satellite photo taken on March 6.

Photo: NASA/GSFC/Jeff Schmaltz/MODIS Land Rapid Response Team

Horizontal convective rolls

A swath of 'cloud streets' rake across the sky directly above the southern tip of Greenland in this amazing satellite photo taken on March 6 aboard NASA's Aqua satellite.

 

Cloud Streets, also known as horizontal convective rolls, are a meteorological phenomenon that occurs when counter-rotating air (rising warm air, sinking cool air) forms parallel lines of fluffy cumulus clouds in the lowest section of the Earth's atmosphere, the planetary boundary layer.