St. Elmo's fire is a stunning weather phenomenon in which electrical discharge from sharp or pointed objects creates plasma with a blue or violet glow. It typically happen during thunderstorms, when there's a strong electric field in the atmosphere.
St. Elmo, or St. Erasmus of Formia, is the patron saint of sailors -- a fitting name considering sailors would sometimes witness the phenomenon on ships at sea, taking it as a sign their patron saint was present. It also appears on aircraft wings, and in these pilots' cases, right over the surface of their airliner's windshield.
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