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upward lightning (plural upward lightnings)

  1. (astronomy, meteorology) an upper atmospheric optical phenomena associated with thunderstorms, in which the lightning bolt projects straight into the upper atmosphere
    • 1999, Patricia Barnes-Svarney, Thomas E. Svarney, Skies of fury: weather weirdness around the world[1], Simon and Schuster:
      Mysterious bluejets can be seen with the naked eye from the ground, but they are rare and difficult to spot.

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