St. Elmo's Fire is an electrical discharge caused by the ionization of the air during thunderstorms. In actuality, it's not a fire at all, it's a plasma.
Sites 3
- The Fire of St. Elmo Describes in detail the events that lead to this strange event.
- Wikipedia: St. Elmo's Fire Introductory article with basic description and a drawing.
- Saint Elmo's Fire Learn what causes Saint Elmo's fire here.