Also, thunderclouds.

1690–1700; thunder + cloud Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
thundercloud (ˈθʌndəˌklaʊd)
1.  a towering electrically charged cumulonimbus cloud associated with thunderstorms
2.  anything that is threatening

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
thundercloud   (thŭn'dər-kloud')  Pronunciation Key 
See cumulonimbus.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Against the grey rock of the kopjes it showed no more than a crow against a
Atmospheric scientists know that ice particles in a thundercloud become
  slightly charged.
They observed five jets spreading outwards and upwards from the thundercloud.
When many small pieces of these frozen raindrops collide with each other in a
  thundercloud, they create an electrical charge.
Related Words
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