Severe weather begins to roll over NASA's Kennedy Space Center on the night launch teams planned to move away from Endeavour.

Severe weather begins to roll over NASA's Kennedy Space Center in Florida on the night launch teams planned to move the rotating service structure (RSS) away from space shuttle Endeavour on Launch Pad 39A. The structure provides weather protection and access to the shuttle while it awaits lift off on the pad. RSS "rollback," as it's called, was delayed by nearly five hours to allow the storms to move offshore. Endeavour and the STS-134 crew will deliver the Express Logistics Carrier-3, Alpha Magnetic Spectrometer-2 (AMS), a high-pressure gas tank and additional spare parts for the Dextre robotic helper to the International Space Station. Endeavour was scheduled to launch at 3:47 p.m. on April 29, but that attempt was scrubbed for at least 72 hours while engineers assess an issue associated with the shuttle's Auxiliary Power Unit 1. STS-134 will be the final spaceflight for Endeavour. For more information visit, www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts134/index.html. Photo credit: NASA/Troy Cryder