That's the only site that shows winds up to 20 to 25 knots. All other sites (windfinder, TWN, wind guru) show 22-30k sustained winds. I can honestly say I have never used the marine forecast over these other sites. It has no detail just a general statement of winds.
Looking back to 2009 with winds from the south and 8footers ... Tournament still went to simcoe , 2011 and 2012 also 4-6 footers. so what has changed?