The much delayed launch of the National Reconnaissance Office spy satellite is scheduled for a new attempt on Thursday 13th September at 2:39pm PDT (21:39 GMT). The initial scrub was called due to a small incompatibility with the range tracking transmitter on the Atlas V rocket.
This was cleared for flight and the new launch attempt was arranged for Thursday. According to United Launch Alliance the weather is expected to be 100% go at launch time. An early afternoon launch time is ideal as it allows the early morning oceanic weather to dissipate providing good clear skies with about 10% cloud cover. If a scrub should occur then the weather prospects for a Friday launch are exactly the same. It is a long time since we have had a 100% GO forecast weather for two consecutive days.
The Atlas V rocket is in the 401 configuration with a 4 Metre payload fairing, no strap-on solid rocket boosters and a single Centaur upper stage.