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A look at the currents in San Francisco Bay between 1300 and 1600 on October 16th 2011, the day that the giant catamaran 'Oracle 17' capsized. Strong westerly winds of between 20 and 30 kts collided with the strongest tide of the year, causing short, steep waves to form just East of the Golden Gate Bridge just at the time the giant cat was turning downwind. The boat's bows buried themselves in just such a wave, causing rapid de-acceleration and consequently the boat pitchpoled (the back of the boat 'overtook' the front causing the boat to cartwheel).