Liftoff of space shuttle Endeavour on the STS-127 mission has been rescheduled for Wednesday, July 15 at 6:03 p.m. EDT.

Monday's attempt was canceled due to poor weather conditions within the launch area at NASA's Kennedy Space Center in Florida. Anvil clouds and storm cells containing lightning flared up toward the end of the countdown, violating stringent launch safety rules.

"Technically, we've been really clean the last two days with our vehicle," Launch Integration Manager Mike Moses said of Endeavour's launch attempts on Sunday and Monday. "It's just been the weather scenario that got us."

The outlook is better on Wednesday, with only a 40 percent chance of weather conditions prohibiting liftoff.