St. Elmo's Fire
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- The glow on a masthead produced by an extreme buildup of electrical charge. Unprotected mariners should immediately move to shelter when this phenomena occurs. Lightning may strike the mast within five minutes after it begins to glow.
NOAA National Weather Service - Cite This Source - This Definition - Anvil Crawler, Anvil Zits, CA, CC, CG, CSDRBL, Heat Lightning, In-Cloud Lightning, LALs, LDS, Lightning, Lightning Discharge, LTNG, Positive Cloud to Ground Lightning, Staccato Lightning, Thunder, Thunderstorm