The United Launch Alliance Atlas 5 rocket, standing 189 feet tall and and weighing 720,000 pounds, unleashes 860,000 pounds of thrust from its main engine at 10:30 a.m. local time (1:30 p.m. EST; 1830 GMT) today to launch the commercial WorldView 4 Earth-imaging satellite for DigitalGlobe from Vandenberg Air Force Base, California.

NOAA’s JPSS 1 weather satellite is enshrouded inside the nose fairing of a Delta 2 rocket, awaiting liftoff from Vandenberg Air Force Base in California on a seven-year mission to collect data to improve global weather forecasts.

This is the launch timeline to be followed by the Atlas 5 rocket’s ascent into orbit from Cape Canaveral with the advanced GOES-R weather satellite for NASA and NOAA. Launch is scheduled for Saturday at 5:42 p.m. EST (2242 GMT).