Heat Lightning
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- Lightning that occurs at a distance such that thunder is no longer audible.
NOAA National Weather Service - Cite This Source - This Definition - Anvil Crawler, Anvil Zits, CA, CC, CG, CSDRBL, In-Cloud Lightning, LALs, LDS, Lightning, Lightning Discharge, LTNG, Positive Cloud to Ground Lightning, St. Elmo\'s Fire, Staccato Lightning, Thunder, Thunderstorm