We only have theories about the biggest waves, because it's hard to get observations to quantify the theory.
This was truly an awesome example of nature taking advantage of everything she's got available.
No matter how much we think we understand the processes of nature, nature can always do something a little different, a little unexpected. It makes you realize how small we are.
Arctic energy from Canada was driving steadily southward, while this ball of tropical energy from the hurricane was moving northward. When they met, it caused this storm to explode, in weather terms.
Is there some hint that global warming is the reason Maybe. Or is it sunspot cycles Is it fluctuations in solar activity We don't know enough to make an absolute answer.