Countdown Proceeding Smoothly

Atlas V rocket on launch pad venting during propellant loading operationsCountdown clocks just passed the T-1 hour mark and activities are proceeding smoothly. Tanking operations continue, and in case you missed it, Launch Weather Officer Clay Flinn has upgraded the forecast to reflect a 90 percent chance of “go” weather at the 7:05 p.m. liftoff time.

Image from NASA TV