An instrument that records or measures the intensity, frequency, and location of lightning strikes during thunderstorms.
From Greek 'keraunos' (lightning) + '-graph' (write/record), literally 'lightning writer,' designed in the 1800s to study storm patterns scientifically.
Before weather radar, ceraunographs were how meteorologists could 'see' storms coming—they could literally watch electricity itself writing messages about dangerous weather approaching.
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