In his compilation volume Tornados, Dark Days, Anomalous Precipitation, and Related Weather Phenomena (1983), veteran anomalies chronicler William R. Corliss defined steam devils as: "Long fingers or columns of vapor rising from a water surface and swirling upward into the cloud deck". Resulting from thermal convection when the water is much warmer than the air, and moulded into shape by air currents, steam devils can sometimes occur in large arrays and yield geometrical patterns, but the reason for their remarkable stability is still a mystery.Read on...
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