Divination or fortune-telling based on interpreting lightning bolts, thunder patterns, and other atmospheric electrical phenomena.
From Greek 'keraunos' (lightning) + 'manteia' (divination), a practice dating back to ancient Greece and Rome where people read lightning as divine messages.
Roman generals actually had trained lightning-watchers called 'auspices' who would interpret storm patterns to decide whether to attack or retreat—essentially using early meteorology for military strategy.
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