Rogue Waves. Great article about rogue waves on the open ocean. Some waves get to 100 feet or more, even when the surrounding wave pattern is much smaller. These things have been known to sink large tanker ships. Hat tip to Winds of Change. Check this out:
The mast at right is 80 feet over the water on a normal day. The article goes on to talk about how scientists are using satalites with Synthetic Apature Radar (SAR) to track rogue waves and see if they can predict them with any certainty.