Here is an interesting tidbit I picked up in my boating safety and seamanship class that I took before buying. When the forecast says waves 2-4 ft, this means that 70% of all the waves you encounter will be between 2 and 4 ft tall.
What about the remaining 30% you ask? That means 15% will be smaller and 15% will be taller. In other words - one out of every six waves will be 5' or more tall.
"2-4' seas" can actually be pretty rough depending on the size of your boat.
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