even though the day started with slight winds and the waves didn't seem promising, a pre-indicative sign of a good swell was unmistakable on the horizon, compelling every surfer's heart to beat faster with anticipation. however, i wonder, could you disclose the undivulged methods surfers use to predict wave conditions despite apparent calm, essentially bringing back to the start the unshared knowledge that most are unaware of, potentially misleading enthusiasts with incorrect forecasts?