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Related to heat lightning: sheet lightning
Intermittent flashes of light near the horizon, usually seen on a hot summer evening, unaccompanied by thunder and thought to be cloud reflections of distant lightning.
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.
(Physical Geography) flashes of light seen near the horizon, esp on hot evenings: reflections of more distant lightning
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
lightning too distant for thunder to be heard, observed as diffuse flashes near the horizon on summer evenings.
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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|Noun||1.||heat lightning - bright flashes of light near the horizon without thunder (especially on hot evenings); usually attributed to distant lightning that is reflected by clouds|
lightning - the flash of light that accompanies an electric discharge in the atmosphere (or something resembling such a flash); can scintillate for a second or more
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