#flash  a sudden intense burst of radiant energy
  supertype:  #happening__occurrence__natural_event__naturalevent  an event that happens
  subtype:  #flicker.flash__spark__glint  a momentary flash of light
  subtype:  #glimmer__gleam__gleaming  a flash of light (especially reflected light)
  subtype:  #glitter__sparkle__coruscation  the occurrence of a small flash or spark
  subtype:  #heat_flash  a flash of intense heat (as released by an atomic explosion)
  subtype:  #lightning.flash  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
     subtype:  #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
     subtype:  #sheet_lighting__sheetlighting  lightning that appears as a broad sheet; due to reflections of more distant lightning and to diffusion by the clouds
  subtype:  #streak.flash  a sudden flash (as of lightning)

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