#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
  supertype:  flash  a sudden intense burst of radiant energy
  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

No statement uses or specializes lightning.flash; click here to add one.