Unfortunately for mariners, the total amount of wave energy in a storm doesn’t rise linearly with wind speed, but to its fourth power. The seas generated by a forty-knot wind aren’t twice as violent as those from a twenty-knot wind, they’re seventeen times as violent. A ship’s crew watching the anemometer climb even ten knots could well be watching their death sentence. Moreover, high winds tend to shorten the distance between wave crests and steepen their faces. The waves are no longer symmetrical sine curves, they’re sharp peaks that rise farther above sea level than the troughs fall below
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