I get a a 60% weather acceptable for launch from this site https://blogs.nasa.gov/orion/ it's a NASA.gov site so I believe it more than other sites, but it's dateline was earlier in the day. Most media only has a 40% chance of acceptable launch conditions tomorrow. Anybody have a good site, even webcast that will update the range weather say around midnight or after? Thanks!Also, how many times can you fuel/refuel an all Lox/H2 rocket like the Delta 4 before you have to stand down for a day and check the stresses in the tank(s)?
Liquid oxygen is being pumped into the Delta IV Heavy’s three core boosters. The RS-68A engines, one at the base of each booster core, burn liquid hydrogen and oxygen to produce the thrust needed to lift Orion off the launch pad and start it on its way to orbit. The second stage, which is also beginning to be filled with propellant, uses the same combination of hydrogen and oxygen though not nearly as much as the first stages use.