From similarity and differences of morphological, biochemical, cellular characteristics, biologist have constructed 'phylogenetic (evolutionary) trees' (who is most closely related to who, analogous to a family tree)
In the United States, lightning routinely kills more people each year than tornadoes or hurricanes. Tornadoes, hail, and wind gusts get the most attention, but only lightning can strike outside the storm itself. Lightning is the first thunderstorm hazard to arrive and the last to leave.
Positive lightning is less common than negative lightning, and on average makes up less than 5% of all lightning strikes. A Bolt from the blue lightning strike which appears to initiate from the clear, but turbulent sky above the anvil cloud and drive a bolt of plasma through the cloud directly to the ground.