In Arkansas, wind shears and unstable weather conditions suitable for forming super cells, extremely large cloud systems capable of generating powerful tornadoes, were approaching Little Rock.

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The research looked specifically at production farms using open, outdoor fresh water ponds applying current technology, and considered such factors as suitable land use, topographical features, weather patterns and sky conditions available in the contiguous U.S. states.

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But radar can be blinded by bad weather, and not all volcanoes are within range of suitable equipment.

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