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shelf cloud

American  
[shelf klaud] / ˈʃɛlf ˌklaʊd /

noun

  1. a low, long, horizontal wedge-shaped cloud that usually forms along the leading edge of a thunderstorm, signaling strong gusts of wind; one of the two main types of arcus. Compare wall cloud.


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

A Canadian captured a timelapse of a shelf cloud formation slowly moving over Newfoundland.

From BBC • May 24, 2023

Video shows a shelf cloud - a type of arcus cloud - form before a thunderstorm hit Portland.

From BBC • Sep. 13, 2022

"This outflow cuts under warm air being drawn into the storm's updraft. As the lower and cooler air lifts the warm moist air, its water condenses, creating the shelf cloud."

From BBC • Sep. 6, 2022

A video showing a shelf cloud forming, ahead of a thunderstorm, has been captured in Dorset.

From BBC • Sep. 6, 2022

The shelf cloud, a smoothed and rounded arc fanning outward just above the ground, was lit from below as it tumbled over the urban glow of Ballston, Clarendon and Rosslyn.

From Washington Post • Jul. 6, 2021

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