"[Weather conditions] look challenging for Thursday," Oh said. "I think we were showing a maybe 80% chance of rain and thunderstorms."
Oh cautioned that conditions look more hopeful for a launch over the weekend but are still not certain for then.
"Things do look better over the weekend but I think we were still 50-50 according to the weather forecast," he said.
In addition, Oh pointed out that there are a limited number of opportunities to do the launch.
"So, I think we may be pretty aggressive in our attempt to get off the ground here. But the weather will need to cooperate with us to do it," Oh said.