UPDATE: The launch has been postponed to no earlier than Saturday, Sept. 23. They need to replace a valve in the booster.
VANDENBERG AIR FORCE BASE, Calif. (ULA PR) — The ULA launch readiness review was completed today everything is progressing toward the ULA Atlas V NROL-42 launch in support of national security.
The mission, for the National Reconnaissance Office, is set to lift off on a ULA Atlas V rocket on Thursday, Sept. 21 from Space Launch Complex-3 at Vandenberg Air Force Base in California. Today’s L-1 weather forecast continues to show 60% favorable conditions for launch. The launch time is 10:38 p.m. PDT.
Atlas V NROL-42 mission profile located here: https://youtu.be/4UjeoySzxPo
Launch Day Forecast
Overall probability of violating weather constraints: 40%
Areas of concern: Launch Visibility, Ground Winds
Overall probability of violating weather constraints for 24 Hour Delay: 10%
Areas of concern: Ground Winds