Astronaut Nicole Stott, top left, a mission specialist and European Space Agency astronaut Christer Fuglesang, of Sweden, members of the space shuttle Discovery crew, arrive at the Kennedy Space Center in Cape Canaveral, Fla., Wednesday, Aug. 19, 2009. Discovery is targeted for an early morning launch on Aug. 25.(AP Photo/John Raoux)

(AP) -- The weather is looking good for Tuesday's launch of space shuttle Discovery.

Forecasters put the odds of acceptable conditions at 70 percent. Launch time is 1:36 a.m.

Discovery and a crew of seven will deliver more than 15,000 pounds of supplies and equipment to the .

NASA test director Steve Payne said everything is on track for the countdown to begin late Friday night. The only outstanding issue is a shuttle power controller that had to be replaced, but Payne said so far, all the testing looks good.

NASA has until Aug. 30 to launch Discovery, otherwise the will have to get in line behind a Japanese cargo ship and a Russian that are set to fly in September.

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