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 an LP storm.
STRIATIONS
Meaning of STRIATIONS in English
Weather and meteorology English vocabulary. Английский словарь погоды и метеорологии . 2012