Quote:
Originally Posted by winniskier
...The only other explanation is a combination of boat wakes that come and stay together in the right place and time. You can created them by doing tight donuts at slow speeds....
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Tight donuts can create huge waves as the various pieces of the wake converge toward the center of the circle and reinforce each other. But the waves pass through each other and spread out, making the area and time of the huge waves small.
However, if there were two or more large wakes made almost but not quite in parallel with each other, then the "focal point" of those intersecting waves will be quite some distance away (very long radius arc). The length and time of the interaction also will be longer.