LIVE IMAGES: Refresh this page for updates and the latest still images from the Air Force 45th Space Wing Weather Channel (left) and Launch Complex 41 (right).
The countdown to the planned launch of an Atlas V rocket at Cape Canaveral Air Force Station is back on track after engineers resolved a pair of minor valve problems, and it appears all systems are "go" for launch at this time.
The 19-story United Launch Alliance rocket and its payload -- a new-generation military communications satellite that will serve troops in Iraq and Afghanistan -- remain scheduled to blast off from Launch Complex 41 at 9:24 p.m. The launch window tonight will extend through 10:01 p.m.
Engineers resolved minor difficulties with a gaseous helium valve on the rocket's Centaur upper stage as well as a gaseous nitrogen valve on a supply tank. Both commodities are used to purge the rocket of an excess gaseous oxygen or gaseous hydrogen that might build up during fuel-loading operations.
Engineers are aiming to begin fueling operations around 7:30 p.m., and the complex 41 area now is being cleared of all but essential personnel in advance of that operation.
The weather forecast for launch now is 70 percent "go." The only concerns are the chance that thick clouds and gusty winds might prevent launch.
You can check out the Official Launch Forecast from the 45th Space Wing Weather Squadron.
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