UPDATE, 1:20 AM: SpaceX's Dragon cargo ship is in orbit en route to the International Space Station after its launch early Sunday aboard a Falcon 9 rocket from Florida. The countdown was smooth and the foul weather that plagued Saturday morning's first attempt stayed away.

The Dragon has now unfolded its solar arrays and is making other preparations for the two-day trip to the station. Grapple by the ISS's robotic arm is scheduled for 6:04 a.m. CDT Tuesday.

UPDATE, 11:50 AM: USAF launch weather officer Mike McAleenan has now upgraded to 90 percent the chance of acceptable weather — exactly the reverse of last night, when the weather was 90 percent likely to be no go.

ORIGINAL POST: U.S. Air Force forecasters now see a 70 percent chance of acceptable weather for tonight's retry at launching SpaceX's cargo ship to the International Space Station.

Liftoff tonight from Cape Canaveral Air Force Station in Florida of the Falcon 9 rocket carrying the robotic Dragon capsule is set for 12:52:03 a.m. CDT. NASA TV coverage, which you can view above, begins at 11:45 p.m.; SpaceX's webcast starts at 12:32 a.m.

The first attempt early Saturday was called off as the storms socking in the Cape showed no signs of letting up by launch time.

Among the cargo the Dragon will be hauling up is a life support module holding 20 mice that will be studied to learn more about the effects of microgravity on mammals (an X-ray machine for that purpose is also on board). Other modules house fruit flies and plant seedlings.

Also on the manifest are a pair of fresh space suit batteries; an IMAX camera that future ISS crews will use to record activities; a 3-D printer used to check the feasibility of eventually making spare parts aboard the station; and a radar system to be mounted outside the station that will track ocean winds.

NASA has more on the research equipment here.

You can also follow the launch on my Twitter feed or Facebook page.