Jisho

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Noun
1. heat thunderstorm
Wikipedia definition
2. Heat lightningHeat lightning is the name used for the faint flashes of lightning on the horizon or other clouds from distant thunderstorms that do not have accompanying sounds of thunder. This occurs because the lightning occurs very far away and the sound waves dissipate before they reach the observer. Heat lightning was named because it often occurs on hot summer nights and to distinguish it from lightning accompanied by audible thunder and cooling rainfall at the point of observation.
Read “Heat lightning” on English Wikipedia
Read “熱雷” on Japanese Wikipedia
Read “Heat lightning” on DBpedia

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