Stormy weather could stall weekend shuttle launch

The crew of space shuttle Endeavour, from left, flight engineer Timothy Kopra, mission specialist's Thomas Marshburn and Christopher Cassidy, commander Mark Polansky, mission specialist David Wolf, Canadian Space Agency astronaut Julie Payette and pilot Douglas Hurley arrive at the Kennedy Space Center in Cape Cananveral, Fla., Tuesday, July 7, 2009. Endeavour and it's crew, scheduled for a July 11, launch, will deliver and install the final elements of Japan Exploration Agency's Kibo laboratory to the International Space Station.(AP Photo/John Raoux)
The crew of space shuttle Endeavour, from left, flight engineer Timothy Kopra, mission specialist's Thomas Marshburn and Christopher Cassidy, commander Mark Polansky, mission specialist David Wolf, Canadian Space Agency astronaut Julie Payette and pilot Douglas Hurley arrive at the Kennedy Space Center in Cape Cananveral, Fla., Tuesday, July 7, 2009. Endeavour and it's crew, scheduled for a July 11, launch, will deliver and install the final elements of Japan Exploration Agency's Kibo laboratory to the International Space Station.(AP Photo/John Raoux) (John Raoux - AP)

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y MARCIA DUNN
The Associated Press
Wednesday, July 8, 2009; 10:20 PM

CAPE CANAVERAL, Fla. -- NASA began another countdown Wednesday for space shuttle Endeavour, but stormy weather could stall the weekend launch.

The space agency will try to launch Endeavour on Saturday night, following a pair of delays last month caused by a hydrogen gas leak. The leak has since been plugged; a fueling test validated the repairs last week. But now, launch controllers will have to deal with thunderstorms.

Forecasters on Wednesday put the odds of acceptable weather at just 40 percent for a Saturday evening launch. Conditions improve only slightly on Sunday.

The seven astronauts assigned to the 16-day mission returned to Kennedy Space Center on Tuesday. They will deliver and install the final piece of Japan's lab at the international space station.

Five spacewalks are planned, more than usual, to complete work on the Japanese lab, replace space station batteries and unload spare parts carried up on Endeavour.

The linked shuttle-station will be home to 13 people for nearly two weeks, a record crowd.

"This promises to be a very exciting mission, and we're certainly eager to get it under way," said NASA test director Charlie Blackwell-Thompson.

The countdown clocks began ticking late Wednesday night.

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