altostratus

[al-toh-strey-tuhs, -strat-uhs]

al·to·stra·tus

[al-toh-strey-tuhs, -strat-uhs]
noun, plural al·to·stra·tus. Meteorology.
a cloud of a class characterized by a generally uniform gray sheet or layer, lighter in color than nimbostratus and darker than cirrostratus: of medium altitude, about 8000–20,000 feet (2450–6100 meters).

Origin:
1890–95; alto- + stratus
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Altostratus is always a great word to know.
So is thermal. Does it mean:
precipitation consisting of small, slowly falling crystals of ice
a rising air current caused by heating from the underlying surface, especially such a current when not producing a cloud
Collins
World English Dictionary
altostratus (ˌæltəʊˈstreɪtəs, -ˈstrɑː-)
 
n , pl -ti
a layer cloud at an intermediate height of about 2400 to 6000 metres (8000 to 20 000 feet)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
altostratus   (āl'tō-strāt'əs)  Pronunciation Key 
Plural altostrati (āl'tō-strāt'ī')
A mid-altitude cloud that extends in flat, smooth sheets or layers of varying thickness. Altostratus clouds generally form between 2,000 and 6,100 m (6,560 and 20,000 ft) and often produce long, steady rain showers. See illustration at cloud.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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