Jisho

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Wikipedia definition
1. Earthquake cloudEarthquake clouds are clouds claimed to be signs of imminent earthquakes. They have been described in antiquity: In chapter 32 of his work Brihat Samhita, Indian scholar Varahamihira (505–587) discussed a number of signs warning of earthquakes, including extraordinary clouds occurring a week before the earthquake. In modern times, a few scientists claim to have observed clouds associated with a seismic event, sometimes more than 50 days in advance of the earthquake.
Read “Earthquake cloud” on English Wikipedia
Read “地震雲” on Japanese Wikipedia
Read “Earthquake cloud” on DBpedia

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