But Johnson Space Center Spokesman John Ira Petty says that's no longer necessary.
"There can't be showers, for example, within 20 miles of the launch pad. And folks in Florida are keeping a good eye on that. We're watching the Trans-Atlantic abort sites as well as the potential sites for landing in the United States should one become necessary. And those are acceptable as well, so actually everything's looking pretty good."
The astronauts will spend most of the 15-day mission fixing a solar panel on the outside of the International Space Station.
"There are going to be four spacewalks on this flight. Three crewmembers will rotate, two will out at a time. They'll be working largely to repair a joint that causes the solar arrays to revolve and track the sun."
The six member crew is scheduled to launch tonight at 6:55 CST.
Laurie Johnson. KUHF-Houston Public Radio News.