St. Elmo's fire is a bright blue or violet glow, appearing like fire in some circumstances, from tall, sharply pointed structures such as masts, spires, and chimneys, and on aircraft wings or nose cones. St. Elmo's fire can also appear on leaves and grass, and even at the tips of cattle horns.[3] Often accompanying the glow is a distinct hissing or buzzing sound. It is sometimes confused with ball lightning.
