storm cells'

storm cell

noun
an air mass formed by powerful updrafts and downdrafts moving in convective loops, the smallest unit of a storm system.
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American Heritage
Science Dictionary
storm cell  
An air mass that contains up and down drafts in convective loops, moves and reacts as a single entity, and functions as the smallest unit of a storm-producing system.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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