Conditions for a Sunday launch of the space shuttle Atlantis have dipped a bit.
Storms are expected a few hours before the afternoon launch.
It's now a 40 percent chance the shuttle will be grounded.
The crew of seven will conduct the first construction on the international space station since the Columbia disaster in 2003.
Aggie Astronaut Michael Fossum, who recently flew on the shuttle Discovery, says he is confident the shuttle Atlantis is ready.
"I wouldn't say we're completely out of the woods, the space shuttle will never be safe, it will never be routine. Every mission is a test mission, but good to go, good to continue, you bet," said Fossum.
NASA won't give the go-ahead if there are storms within 23 miles of the landing runway.