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.
All thunderstorms produce dangerous lightning, both during the day and at night. Storms that form at night are likely to produce hail, damaging winds, and flooding rain. Tornadoes, however, are much more likely during the day, especially during the late afternoon and early evening, not at night. Tornadoes are also much more common in the spring than in the summer in most parts of the country.