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Maelström-Enhanced storm of middle area with an eye in the middle pulling the ships inside, causing increasing damage by getting closer. Any ship that would reach the middle of it would receive massive damage.
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Heavy rain-Enhanced storm of great area, without lightning strikes, very quickly filling the ship with water.
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Light rain-Common storm of small area without lightning strikes, slowly filling the ship with water.
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Crushing waves-Medium area of significantly larger waves with a slower occurrence that can push the ship to other direction. (Possibly pushing players themselves into the sea If they are not careful)
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Stronger wind and Water currents-Rarely encountered sea occurrences that could either speed/slow your ship a lot.
It would be cool to see at least few of these things making it into the game. Some may say its unnecessary, but I think that we've really conquered the sea bit too much lately and we are hardly ever truly endangered by the current sea hazards.