The White Room crew has closed the hatch and will pressurize the crew cabin, check for leaks then finish remaining tasks before departing the pad.
Meanwhile inside the Endeavour, the shuttle’s six astronauts are running through prelaunch tests and checks.
All systems are “go,” with no technical issues being reported although cloud cover over the launch pad has changed the forecast from “go” to “no-go” at this time. Weather officers are cautiously optimistic that the clouds will move out of the area in time for launch at 4:14 a.m. EST.