Tanking Underway

Earlier this morning, the Mission Management Team met and gave the "go" for loading space shuttle Atlantis' external tank with 500,000 gallons of liquid oxygen and liquid hydrogen, which began at 5:03 a.m. EST.

The three-hour fueling process will provide the fuel and oxidizer Atlantis' three main engines require for the 8 1/2 minute trip to orbit.

Weather forecast is now at a 70-percent chance of favorable weather for an on-time liftoff at 2:28 p.m. this afternoon.

NASA Television is providing live commentary of external tank loading and launch commentary and blog will begin at 9:30 a.m.