HAVANA — Swimmer Diana Nyad is back on track and doing well today after a night of storms and jellyfish stings roughed up her bid for a record swim from Cuba to Florida.

Nyad, who turns 63 Wednesday, is making her third attempt to become the first person to swim across the Straits of Florida without a shark cage. She also made a failed try with a cage in 1978.

Nyad’s operations manager Mark Sollinger told the NBC “Today” show that things couldn’t be better after the sun rose on her third day in the water. She left Havana on Saturday headed for the Florida Keys.

She’s accompanied by a support team in boats. They tweeted Sunday night that a storm blew Nyad off course temporarily and she suffered jellyfish stings.

But by morning, Nyad was swimming a strong 50 strokes per minute, Sollinger said on NBC by phone from a boat shadowing Nyad.

“Her stroke looks good and we’re moving in the right direction,” he said.

A kayak-borne apparatus shadowing Nyad helps keep sharks at bay by generating a faint electric field that is not noticeable to humans. A team of handlers is always on alert to dive in and distract any sharks that make it through.

The team expects Nyad will take at least 60 hours to complete the swim, meaning she would arrive in the Florida Keys sometime Tuesday.

She takes periodic short breaks to rest, hydrate and eat high-energy foods like peanut butter.