RedactedNarrative: Powerboat was anchored off stern. Wind event caused swamping and then capsizing of boat.  At a little after midnight the operator and passenger boarded their boat and anchored about 75 yards off shore for the night. The operator used a river type anchor (fluted mushroom) weighing about 10 pounds with no chain. The anchor line was 49 feet in length and the depth of the water was approximately 25 feet where they anchored for the night. The anchor line was attached to a starboard cleat near the transom. They were sleeping and were awakened by the sound of the wind and waves crashing into the boat at about 2 AM. The wind and waves drove them across the lake, dragging the anchor, to the east shore. The operator did not attempt to start the engine, turn on the bilge pump or cut the anchor rope. Near shore the boat swamped and began to capsize. The couple jumped out of the boat and waded to shore. They watched the boat capsize once they got to shore.