Striations
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- Grooves or channels in cloud formations, arranged parallel to the flow of air and therefore depicting the airflow relative to the parent cloud. Striations often reveal the presence of rotation, as in the barber pole or "corkscrew" effect often observed with the rotating updraft of a Low Precipitation (LP) storm.
NOAA National Weather Service - Cite This Source - This Definition - ACCAS, Barber Pole, Chinook Arch, Laminar, Rotor Cloud