You could be right. I think the opposite, that Pangea broke up as a consequence of the flood. I'm ex navy, so I know what serious storms can be like. Remember that the ark was huge, comparatively light for its size and only had to last for 13 months. I reckon it would have floated like a cork. It is also true that tsunami waves are not hazardous in deep water. Ships hardly notice them. The Poseidon Adventure got that completely wrong.
The wind would be a bigger problem. There are monster waves that I'm glad I never encountered. I would not be here to talk about it.
Since God is in control, I doubt that the ark was ever in serious danger.