Sunderland, 16, who has been attempting to sail around the world alone, endured multiple knockdowns in 60-knot winds before conditions briefly abated.
However, her parents lost satellite phone contact with her early Thursday morning and an hour later were notified by the coast guard at French-controlled Reunion Islands that both of Sunderland's EPIRB satellite devices on board her vessel Wild Eyes had been activated.
One of the devices is apparently attached to a survival suit and is meant to be used when a person is in the water or a life raft. This means Abby is likely in the ocean somewhere. The vessel whereabouts is not known.
Abby's father said he didn't know if his daughter was in a life raft or aboard the boat, or whether the boat was upside down.
THIS WAS HER LAST BLOG POST LAST NIGHHT
The wind is beginning to pick up. It is back up to 20 knots and I am expecting that by midnight tonight I could have 35-50 knots with gusts to 60 so I am off to sleep before it really picks up.
++VIBES for a safe return