Abby Sunderland, a 16-year-old attempting to circumnavigate the globe by herself in a sailboat, is feared lost at sea, according to ABCNews.com.
Sunderland activated two emergency beacons between 7 and 9 a.m. ET Thursday, her mother, MaryAnne, told ABCNews.
An engineer on Sunderland's support team, Jeff Casher, said the beacons indicate that she is in trouble. He said that he last talked with Sunderland at about 9 a.m. ET, when she told him she had been knocked down twice because of strong winds. The wind ripped the radar off the boat, Casher said.
Her last blog entry Wednesday night said she had encountered some rough weather. "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," she wrote on her blog.
Sunderland, who is from Thousand Oaks, Calif., left from Marina del Rey on Jan. 24. Her 40-foot boat is called "Wild Eyes."