Waterside view of Delta 4 GPS 2F-6 Launch

Launching for the 50th time, an Atlas 5 rocket flew a milestone mission Wednesday in deploying a Global Positioning System satellite for the worldwide utility.

The preliminary weather forecast for Tuesday evening’s Atlas 5 rocket launch carrying a Navy communications satellite predicts a 60 percent chance of acceptable conditions, with thick clouds the main threat against flying at 7:43 p.m. EST as scheduled.

Watch a view of the Falcon 9 rocket’s liftoff Wednesday from the Kennedy Space Center as seen from the press site around three miles from the launch pad.