First, the news: SpaceX has released video of their first stage booster soft-landing in the Atlantic Ocean after boosting a communications satellite to orbit on July 14. The landing was an almost complete success - an amazing achievement. Next trials will attempt to land the first stage back on land, for reuse. See the landing HERE
Now, for the launch: United Launch Alliance will boost two satellites for the Air Force from Cape Canaveral this evening aboard a Delta IV rocket. It should be a spectacular near-sunset launch at 7:03 pm EDT. Watch it via webcast HERE
Having worked there and done that, planning a launch in July is a low-percentage bet.
They say they'll try again tomorrow, which is astonishing. I've NEVER seen five consecutive launch attempts without a break for on-pad fuel replenishment, vehicle maintenance, or just plain crew fatigue. The Air Force must REALLY want these birds up soonest.
Looks like it's going to be Weather Gods-4, Rocket Scientists-0.
Thunderstorms in the area once again (Hey, it's Florida in July, eh?). Should there be a break allowing launch, the window tonight is 6:51 pm EDT until 7:56.
Because if you are going to launch to the east, falling rocket stages might kinda upset folks. V'Berg is used for polar orbit launches (to the south) only. The Cape is used for all other launches (to the east) including to geosync orbit, like this one.
They are fueling the rocket for try number five. Weather is better, with a 60% chance of maybe. Tomorrow's weather is expected to be much worse, so if they don't succeed today, they may push this one back a week or more. There's another launch set for Friday, so they can't try this one again before then.
Tonight's attempt will be from 6:43 - 7:48 pm EDT. Webcast up at 6:23. HERE