Jisho

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Noun
1. volcanic thunderstorm
Wikipedia definition
2. Dirty thunderstormA dirty thunderstorm (also, Volcanic lightning) is a weather phenomenon that occurs when lightning is produced in a volcanic plume. A famous image of the phenomenon was photographed by Carlos Gutierrez and occurred in Chile above the Chaiten Volcano. It circulated widely on the internet. Other instances have been reported above Alaska's Mount Augustine volcano, and Iceland's Eyjafjallajökull volcano.
Read “Dirty thunderstorm” on English Wikipedia
Read “火山雷” on Japanese Wikipedia
Read “Dirty thunderstorm” on DBpedia

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