The reason surf forecasts are only at the most, three days out in advance is because just about any forecast more the 24 hours out is really up in the air, Mother Nature chooses what she wants to do and weather patterns are constantly changing. You have to watch winds over a given area of the ocean and pay close attention to the "Fetch" and direction. Then there are the great circles, bottom contours (continental shelf also) local winds, swell height and swell period, tides etc.
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