GFC - I've heard of "period" in seconds between waves...but have never seen distance between crests posted in a weather forecast/buoy report...
I'm curious, where are they reported/forecast????
Periods of over 7 seconds many consider more swell than wave..but yes wind driven waves on top can make a sloppy ride. Waves/swells over 6 feet and you should be looking for longer periods as they grow larger.
Just a rough sketch...but this is what a 6 foot wave with 18 feet between crests would look like....
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