The U.S. Air Force 45th Weather Squadron is forecasting a 60 percent chance of favorable weather for Tuesday's SpaceX Falcon 9 rocket launch.

The rocket with a Dragon cargo spacecraft loaded with more than 3,700 pounds of scientific experiments, technology demonstrations and supplies is scheduled to blast off from Cape Canaveral Air Force Station at 6:20 a.m. on a resupply mission to the International Space Station.

This is the sixth trip by a Dragon spacecraft to the ISS.

As part of the launch, SpaceX also plans to land the first stage of the Falcon 9 rocket on a barge, part of future plans to try and save rocket parts and save money.

NASA says the Dragon spacecraft will remain attached to the space station's Harmony module for more than four weeks and then splash down in the Pacific Ocean, off the coast of Baja California, bringing with it almost two tons of experiment samples and equipment from the station.