4:30 p.m. And the launch has been put on hold. Weather violations make this a no go for today. You got to have perfect conditions for these missions, folks.
4:27 p.m.: The Falcon 9 just switched to internal power at a little more than 6 minutes out.
4:24 p.m.: We're about 9 minutes out from launch, and there's some concern about weather. But so far, all of the systems are ready to go. If they scrub the launch today, there's another opportunity for the same time tomorrow (around 4:10 p.m. Eastern).