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blue jet

a faint discharge of blue light from the top of a thunderstorm cloud that propagates upward: extends approximately from the bottom to the top of the stratosphere and is not detectable from the ground.
Also called reverse lightning.
Origin of blue jet
1990-95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for blue jet
Historical Examples
  • Have marked the thin, blue jet of smoke from my flashing muzzle hurled.

    Frontier Ballads Joseph Mills Hanson
blue jet in Science
blue jet  
A conical discharge of blue light that starts from the top of active thunderstorm clouds and proceeds upward. Blue jets can last up to several hundred milliseconds and are believed to connect the top of a thundercloud with the ionosphere.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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