The Artemis sailing team includes the gold medal winning Olympic sailor, Iain Percy, from Southampton, who is the sailing director and tactician. It is not known which crew members were onboard at the time of the capsize off San Francisco.
Two other British sailors, John Gimson, also from Southampton, and Andrew Simpson, from Surrey, are part of the AC sailing team. The Artemis website confirms their boat had capsized and says support boats are helping to recover the crew from the water.
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The latest weather for the east with Philippa
The latest weather for the west with Philippa
Met Office issues storm warnings overnight as 80mph winds are expected across the south and east. Storm Imogen is due at around 3am