Space X's Falcon 9 rocket lifts off from Cape Canaveral, Florida on April 18, 2014 carrying its Dragon CRS3 spacecraft on a resupply mission to the International Space Station (ISS). Private US firm SpaceX launched its unmanned Dragon capsule to the International Space Station on April 18, 2014, its third trip carrying supplies and equipment to the orbiting lab. After three earlier delays, the Falcon 9 rocket and its Dragon capsule finally blasted off as planned at 3:25 pm (1925 GMT) from Cape Canaveral in Florida. AFP PHOTO / Bruce Weaver (Photo credit should read BRUCE WEAVER/AFP/Getty Images)
SpaceX is expected to attempt a third launching of the Falcon 9 rocket and six Orbcomm satellites late Sunday afternoon, but weather is a concern.
Showers and thunderstorms are expected and Air Force meteorologists predict a 20 percent chance of adequate weather. The launch window has been widened from the normal hour to 5:30 p.m. to 8:08 p.m.
Weather forced Saturday's launch to be canceled and fluctuating rocket tank pressures stopped Friday's attempt.