iwindsurf can be terribly off but the gliderport is usually spot on. My cutoff is 10/12 if its anything north of W, 12/15 if its south of west. Also consider how long its been blowing. Several hours of 10+ from the NW means nasty chop.
Swell forecasts are largely useless since the launch is so affected by the cove/canyons. I never call it off due to surf and I have never seen surf that was unlaunchable. Scary, but not unlaunchable.
