Robin Roberts Leaving Good Morning America One Day Early

Robin Roberts hosts ABC's "Good Morning America" at Rumsey Playfield, Central Park on August 24, 2012 in New York City. Credit: D Dipasupil/FilmMagic

Robin Roberts is beginning her medical leave from Good Morning America one day early -- making her final appearance, for now, on the ABC program on Thursday.

ABC News announced that Roberts, 51, plans to travel to Mississippi to be with her ailing mother, Lucimarian, and other relatives as they weather Hurricane Isaac.

"I'm having to move up my schedule," Roberts explained Thursday morning."I am very blessed," she added. "Forty percent of Americans can't even take a sick day, and here I know that I'm going to have a job when I come back."

Friday Aug. 31 had been Roberts' planned final day as she gears up for a bone marrow transplant. Back in June, Roberts revealed to fans to that she is battling myelodysplastic syndrome (MDS), a rare blood and bone marrow disorder -- with her sister, Sally, acting as the donor.

"My doctors tell me I'm going to beat this -- and I know it's true," Roberts, who beat breast cancer five years ago, wrote on GMA's website. "They say I'm younger and fitter than most people who confront this disease and will be cured."