up draft

updraft

[uhp-draft, -drahft]
noun
the movement upward of air or other gas.

Origin:
1400–50; late Middle English; see up-, draft

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

updraft
"rising air current," 1909, from up + draft (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
updraft   (ŭp'drāft')  Pronunciation Key 
An upward current of warm, moist air. With enough moisture, the current may visibly condense into a cumulus or cumulonimbus cloud. Compare downdraft.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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