I find the weather/wind report posted on WW.Com > Web links> Weather: to be extremely accurate. I review it every day before heading out to go fishing. Last week I went out with wind supposed to start at noon. Fortunately the reported wind arrived 45 minutes late which was beneficially because I started back later than I should have.
SailFlow is the one I have found to be the most accurate for anywhere. Is gives you very forecasts for very specific areas by weather station. I have been using this for a few years now for all my fishing trips and find it to be about as accurate as any forecast can be.