St. Elmo’s fire is a bright blue or violet glow that usually appears on a sharp object like a lightning rod, ship’s mast, church steeple, chimney or airplane wings. Even leaves, grass or cattle horns can show St. Elmo’s Fire. It can sound like a hissing sound or a buzzing sound. St. Elmo’s Fire is a mixture of gas and plasma. The electric field around the structure cause air molecules to ionize a faint glow, easily seen in low light situations. The presence of hydrogen and oxygen in the earth’s atmosphere causes the blue or violet color.