madal horisontaalne kiilukujuline arcus-pilv, mis on kinnistunud ema-pilve (tavaliselt rünksajupilve) külge
Good to know
Rünksajupilve esiosas areneb tugev sooja ja niiske õhu tõusuliikumine. Pilve keskosas ja tagalas on intensiivne hoogsadu ja selle aurumine kutsub esile õhu jahtumise ja laskumise. Tõusva sooja ja laskuva külma õhu koosmõjul tekib tugev tuulekeeris, mis tõstab tekkinud veeauru taas üles, kus see jahtub ja kondenseerub. Selle tulemusena tekib pilve ette äikesevall.
a low, horizontal wedge-shaped arcus cloud, associated with a thunderstorm gust front (or occasionally with a cold front, even in the absence of thunderstorms)
Good to know
Unlike the roll cloud, the shelf cloud is attached to the base of the parent cloud above it (usually a thunderstorm). Rising cloud motion often can be seen in the leading (outer) part of the shelf cloud, while the underside often appears turbulent, boiling, and wind-torn.
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