funnel cloud

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funnel cloud

n.
A funnel-shaped cloud descending from a larger cloud, especially from a wall cloud, caused by the sudden condensation of water in the extreme low pressure of rapidly rotating air, as typically occurs in a tornado.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

funnel cloud

n
(Physical Geography) a whirling column of cloud extending downwards from the base of a cumulonimbus cloud: part of a waterspout or tornado
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

fun′nel cloud`


n.
a rapidly rotating funnel-shaped cloud extending downward from the base of a cumulonimbus cloud, which, if it touches the surface of the earth, is a tornado or waterspout.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Wednesday's "cold air funnel" formed about 12 miles north of Eugene, said Peggy Peirson, emergency services coordinator for Benton County.
Portland was spared the flurries because the cold air funneled into the southern part of the Willamette Valley, Keirns said.