"NASA has completed a review of the Ares I-X development rocket's readiness for its flight test and selected Tuesday, Oct. 27, as the official launch date. Liftoff is scheduled for 8 a.m. EDT from NASA's Kennedy Space Center in Florida."
NASA has two days to launch Ares I-X before rocket range is lost, Huntsville Times
"NASA has two days - Tuesday and Wednesday - to launch the Ares I-X test rocket or it could be delayed until December or perhaps next year, said test Launch Director Jeff Spalding this afternoon. Including the Ares I-X test, Kennedy Space Center and Cape Canaveral Air Station have five launches to work over the next month - Ares, a shuttle mission, and three commercial launches."
The NASA Ares 1-X rocket is set for launch -- but watch those clouds!, Christian Science Monitor
"That electric charge can interfere with communications between the rocket and the ground. Since this is a test flight, no one wants anything to block the flow of data from the rocket to eager engineers back at the Kennedy Space Center. And if the range-safety officer has to blow up the rocket during its ascent because it's misbehaving in ways that threaten life or property, you want to make sure the explosives on the rocket receive the detonation command. This isn't a concern for the space shuttles. They were designed with this phenomenon in mind. But the Ares 1-X is a different beast, and the rule has come back into play."