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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Example sentences
Most of the rain produced by the thunderstorm evaporates into relatively dry air beneath the storm cell.
Another storm cell with scattered moisture is predicted for later tonight.
Weather uplinks have delays, sometimes long enough a storm cell can grow from nothing to maturity between sequential updates.
The hole that may open up in a weather system or in a storm cell may close within minutes from the time it opens up.
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