Out of the Cradle is live blogging it. They seem to be weather delayed right now.

[Update at about 3 PM Pacific (two hours before the launch window closes]

They need to check valves on the LOX fill tanks and then clear the area restarting the countdown in 1 and a half to two hours.
What been driving the delays? weather? equip?
Weather at one point – then lox – no other
Boiloff of mechanical – doesn