Diana Nyad Attempts Cuba-Florida Swim. Again.

Diana Nyad startled the world by announcing that she's making a second attempt at swimming 103 miles from Havana to Key West, a feat that she tried and failed to accomplish earlier this summer.

Nyad, 62, jumped into the water Friday night in Cuba in hopes of taking advantage of a forecast of favorable weather over the weekend, according to her blog.

"This weekend is my magical moment," she says on Twitter. "I can't imagine any other ending than making it to the other shore."

If all goes as planned, she will be in the water for approximately 60 hours and reach Key West sometime on Monday.

Saturday morning update: After a rocky night dealing with jelly fish stings, Nyad picked up her pace in the morning, her team reports. From Nyad's blog, "Diana seems to be gaining strength. Her rest times per hour are less and less. At 10:55am, she just had a hydration and a full feeding, and her stroke is beginning to be stronger."

Saturday afternoon: "At 3:15pm [Eastern time) today, Diana is now 35 statutory miles from Havana about one-third of the way to Florida," her team reports. She encountered a shark, but a crew member managed to chase it away.

Saturday night: Nyad received medical treatment after being stung in the face by jellyfish and resumed her Cuba-Florida swim around midnight, according to her blog. You'll find the latest here.

Sunday morning: Nyad was pulled out of the water shortly after 11 a.m. (Eastern time). She swam more than 67 nautical miles -- about two-thirds of the distance.  Read SecondAct's complete report here.

In August, Nyad, plagued by rough waters, asthma problems and an unexpected shoulder injury early on, had to pull the plug on her dream.

Before those woes made it impossible to continue, she did manage to swim continuously for 29 hours and get nearly to the halfway point. That performance apparently gave her the confidence that she can make it on a second try.

"That 29 hours was like an expensive training swim," she tells CNN.

Compared to the media splash that surrounded her prior attempt, Nyad and her team of advisors and handlers kept it a secret that she would try again so soon. Even her Xtreme Dream blog only hinted at the plan, telling fans that she again was in Cuba, and would have "more to say" at a news conference today. The site also posted this video of Nyad training in Pasadena with Bonnie Stoll, her chief handler.

In the video, Stoll says that Nyad didn't want to wait another year, but that if weather permitted, she wanted to make another try this season. The asthma attack that crippled Nyad last attempt, Stoll explains, was an unexpected setback. "She'd never had an asthma attack before," Stoll says.

Nyad hopes the third try will be the charm, and that she will finally accomplish a feat that she first attempted in 1978, when she was just 28. Only one other swimmer, Susie Maroney in 1997, has ever finished a fully documented Havana-to-Key West swim, and Nyad would be four decades older than Maroney was. She also would be first to accomplish it without a protective shark cage.

Read more: Diana Nyad By the Numbers

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