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As for how much (and why) wind vs tide kicks up a nasty sea; I have never really understood the magnitude of the effect. It seems much greater than you would expect from a few knots increase in velocity at the air-water interface.

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Yeah! Why!?!?

12 knot wind over still water will create some sea state or other, but a 10 knot wind against a 2 knot tide seems to create a much greater effect.

To do with more energy in the system because 2 knots is down to the water which carries a lot more energy than 2 knots of air flow (half m v squared)?

Seems counter intuitive though - it's all relative surely.

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