Live coverage: Atlas 5 countdown and launch journal

After making landfall in South Florida, Hurricane Irma moved north over the state before losing strength and being downgraded to a tropical storm. NASA safety officials report the Kennedy Space Center lost electricity and water pressure during the storm, but a team of emergency personnel at the spaceport is safe.

The next Atlas 5 rocket launch from Cape Canaveral will be delayed two weeks to resolve an undisclosed issue with the payload, United Launch Alliance officials announced Friday.

The heavy-lift version of the United Launch Alliance’s new Vulcan rocket will sell for half the price of today’s Delta 4-Heavy and a third of the price tag for the previous Titan 4, while offering a substantial increase in performance for nation’s largest defense spacecraft.