Lightning FlashesOctober 11th Fact-of-the-Day
Lightning flashes usually consist of 3 or 4 individual discharges called strokes. The individual strokes last only a few ten-thousandths of a second, but the persistency of human vision makes them seem to last longer. A multi-stroke lightning flash may appear to be a single steady flash or a flickering flash depending on stroke brightness, time between strokes, and the visual persistency of an individual human observer. The individual strokes in a flash typically are spaced in time such that most lightning flashes last about 250 milliseconds from the first stoke to the last. However, because of human visual persistency, they appear to last longer. ©2004 Martek International All rights reserved.
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