Stormy weather delayed Monday evening's scheduled liftoff of NASA's shuttle launch, once again.

It was the U.S. space agency's fifth attempt to launch the space shuttle Endeavor and its seven astronauts to the international space station.

Endeavor is carrying the final segment of the $1 billion space station lab.

Weather forecasters predict the launch could be postponed until Wednesday. Otherwise, it will have to wait until the end of the month, because of a Russian supply ship that is awaiting liftoff.

Endeavor is scheduled to be at the station for almost two weeks. Five spacewalks are also planned.