The wavelength is the distance between adjacent crests or adjacent troughs.
It would be best to describe with illustrations, but I"m not that motivated at the moment.
swell period and swell height will both increase with 3 factors:
- wind speed
- wind duration
- wind fetch (the distance over which the wind blows).
Most people think that it depends on how far away the storm is, but this is not true, it just so happens that the fetch and duration are generally higher with storms out in the middle of the ocean.
Take a look at a buoy when it is blowing 40+ directly offshore. You will see how high the periods get in such a short distance, because of how strong the winds are.
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Would six feet @7 seconds only be like hest high? And six feet @12 seconds be overhead high?