The mission is scheduled to lift off at 3:22 p.m. Eastern time from the Kennedy Space Center in Florida. Coverage of the launch on NASA Television began at 11 a.m.
How’s the weather?
Not the most promising. Weather forecasts currently give a 50 percent chance of favorable conditions at the launch site. The next opportunity on Sunday is slightly better, with a 60 percent chance of favorable conditions; if that doesn’t work, they will try yet again on Tuesday.
Lots of basic info at the NY Times