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This is the final planned hold of the countdown. Managers overseeing the launch will conduct final readiness polls and SMAP will be transferred to internal power. Liftoff is scheduled for 9:22 a.m. EST.

The launch team now is targeting 9:22 a.m. EST to allow additional time to analyze upper level wind data in order to determine whether launch will be possible today.

There are no technical concerns and weather remains observed "go" and forecast to be 100 percent "go" for launch of the United Launch Alliance Delta II carrying NASA's Soil Moisture Active Passive spacecraft to space. Upper level winds are 74 knots at about 40,000 feet.

The countdown has resumed. There is one more hold coming up at the T-4 minute mark.

The ELaNa X payload comprises three Poly Picosatellite Orbital Deployers, or P-PODs, containing a total of four CubeSats. These four small satellites represent three separate missions known as ExoCube, GRIFEX and FIREBIRD-II (A and B). Learn more about each of these missions with the ELaNa X fact sheet. For more about the ELaNa project, visit …

This is a built-in hold lasting 20 minutes.

The rocket's engines are being put through a series of movements, called "slews," to verify they're able to steer properly. Slew checks begin with the second stage and finish with the first stage.

There is one hour to go until the three-minute launch window opens at 9:20 a.m. EST. The countdown is proceeding smoothly toward liftoff of the Delta II rocket carrying NASA's Soil Moisture Active Passive observatory.

Command receiver/decoder checks with the Western Range are coming up next. This is a routine test verifying the communication links between the vehicle and the Range Safety Office, which would need the capability to send destruct commands to the rocket's flight termination system in the unlikely event the vehicle strayed off course.

The Delta II rocket is fully fueled at this point following completion of LOX loading.