Menacing storm clouds roll through the Launch Complex 39 Area at NASA's Kennedy Space Center.

Menacing storm clouds roll through the Launch Complex 39 Area at NASA's Kennedy Space Center. Seen in the photo is the lower parking lot for the NASA News Center where the media's vehicles and satellite trucks are situated the day before (L-1) the second scheduled launch attempt for Space Shuttle Atlantis on mission STS-115. During the STS-115 mission, Atlantis' astronauts will deliver and install the 17.5-ton, bus-sized P3/P4 integrated truss segment on the station. The girder-like truss includes a set of giant solar arrays, batteries and associated electronics and will provide one-fourth of the total power-generation capability for the completed station. This mission is the 116th space shuttle flight, the 27th flight for orbiter Atlantis, and the 19th U.S. flight to the International Space Station. STS-115 is scheduled to last 11 days with a planned landing at KSC. Photo credit: NASA/Troy Cryder