Fascinating and very scary! The lightning is equally scary. This video clip by National Geographic shows instances of lightning (in slo-mo!) and hail in tornadoes.
Trivia for you: Noriyuki Morita contracted spinal tuberculosis at the age of 2, and spent the next 9 years in the hospital. There, an Irish chaplain named him "Patrick Aloysius Ignatius Xavier Noriyuki Morita" and he adopted "Pat" as his first name for the rest of his life.