A Delta IV rocket will wait until Friday to launch from the Space Coast as stormy weather continues to be a problem.
The new launch window is scheduled from 8:03 p.m. to 8:24 p.m. on Friday.
United Launch Alliance said the forecast for Friday shows a 90 percent chance of favorable weather conditions for launch.
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Cumulus and anvil clouds, along with lightning from Thursday's storms, were the primary concerns for Thursday night's launch attempt. Weather conditions look much better for a Friday night launch, though solar activity could be a concern then.
When it does launch, the Delta IV is set to deliver the GPS 2F-6 satellite to orbit. The satellite is designed to improve accuracy for GPS devices used by the military, and is also supposed to help enhance navigation data for public GPS devices, including the ones in our cars and smartphones.
The United Launch Alliance said it may have to start relying on the Delta IV rocket more than the Atlas V, because Russia is threatening to cut off shipments of the engine used by the Atlas model in response to rising tensions with the U.S. over Russia's takeover of the Crimea region of Ukraine.
Russia's deputy prime minister also said the country plans to end participation on the International Space Station in 2020.
In a statement, the ULA said: "We are hopeful that our two nations will engage in productive conversations over the coming months that will resolve the matter quickly."
ULA officials said they have a two-year supply of Atlas V engines, and if the situation isn't resolved by that time, the company will rely on Delta IV rockets for future national security launches like this one.
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Source: United Launch Alliance