In order to understand the total picture of what goes on at SwellDirection. Com everyday, you need to understand the two concepts of Swell Direction and Swell Windows. Each beach has a window in which it can see swell. The spot that you surf alot has a window where any swell that is generated out in the ocean where your spot can see it, will get the swell. Maybe an example right now may be a good thing.
Lets take Huntington Beach in California.
In order to begin, you need to have a few things. This is for an estimation only - it gives people a start at the insight of what happens. Now take the map and find your spots on it. Well, why can't I just extend out these lines and try and predict when the next swell comes in. I would go into why but its not in the scope of this faq page.