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Mission Status Center - Spaceflightnow.com

3:56 p.m. PDT - The launch team has been given a "go" to begin fueling the Delta 4 rocket with supercold liquid hydrogen and liquid oxygen!

3:10 p.m. PDT - Mission managers are continuing to monitor the situation. No decision has been made to begin fueling the Delta 4 rocket for tonight's launch.

2:09 p.m. PDT - Countdown clocks are running for today's Delta 4 launch. But strong winds at Space Launch Complex 6 are violating the allowable limit during the time crews load propellants into the rocket. So the fueling operations are on hold pending improvements with the weather.

Weather data at 3:40 p.m. PDT
64 °F
Scattered Clouds
Wind: 9 mph from the West
Ceiling: 23000 ft, scattered clouds 13000 ft

[WSGilcrest]

0047 GMT (8:47 p.m. EDT Tues.)

Second stage liquid oxygen tank is now loaded.

0044 GMT (8:44 p.m. EDT Tues.)

The countdown is entering the last two-and-a-half hours before launch. Fueling of the Boeing Delta 4 rocket continues for today's 8:14 p.m. PDT (11:14 p.m. EDT; 0314 GMT) liftoff from Vandenberg Air Force Base, California.

0041 GMT (8:41 p.m. EDT Tues.)

Post-filling tests on the first stage liquid oxygen system have been performed. The tank is now entering topping mode.

0032 GMT (8:32 p.m. EDT Tues.)

Loading of the first stage liquid hydrogen tank is reported complete.