Strange 'Cloud Streets' in Warsaw, Poland - April 18, 2012

"'Cloud streets' are created when convection currents cut low-lying cumulus into long, clean strips."

Horizontal convective rolls, also known as horizontal roll vortices or cloud streets, are long rolls of counter-rotating air that are oriented approximately parallel to the ground in the planetary boundary layer.

Horizontal convective rolls are counter-rotating vortex rolls that are nearly aligned with the mean wind of the convective boundary layer.

Another video example of a "Cloud Street".

Source: Sheilaaliens

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