Air Force meteorologists offered an improved weather forecast for Friday’s launch of the Orbital ATK CRS-4 resupply mission to the International Space Station. The likelihood of acceptable conditions has grown to 40 percent for launch time at 5:33 p.m. EST, the start of a 30-minute window. Our continuous countdown and launch coverage of the cargo-laden Cygnus spacecraft atop an Atlas V rocket will begin at 4:30 p.m. on this blog and on NASA TV, which can be linked from here or streamed at www.nasa.gov/ntv