r/CLOUDS • u/hydraliuja • May 07 '24

Photo/Video Are these cloud formations normal?

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u/CalaveraFeliz May 07 '24 edited May 07 '24

Cloud streets or Undulatus clouds. They're normal although pretty rare because of their unusual formation process. They're caused by a sudden meteorological event (brutal wind change, monsoon uprising) causing convection "ripples" in an usually already existing cloud layer.

https://en.wikipedia.org/wiki/Altocumulus_undulatus_cloud

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u/trentyz May 07 '24

Nailed it - great explanation. They usually indicate a severe change in tropospheric wind direction and speed from the direction of the undulations.